Notochord
... The largest group, the ascidians or sea squirts (Class Ascidiacea) as adults are marine, sessile, filter feeding organisms that live either solitarily or in colonies. ...
... The largest group, the ascidians or sea squirts (Class Ascidiacea) as adults are marine, sessile, filter feeding organisms that live either solitarily or in colonies. ...
Veterinary Developmental Anatomy
... the latter commonly rests on a basal lamina produced by epithelial secretion. Mesoderm can transform from a mesenchyme to an epithelium and vice versa: The mesoderm that streams through the primitive streak is primary mesenchyme. Somatic, splanchnic, and somite mesoderm can be temporarily an epithel ...
... the latter commonly rests on a basal lamina produced by epithelial secretion. Mesoderm can transform from a mesenchyme to an epithelium and vice versa: The mesoderm that streams through the primitive streak is primary mesenchyme. Somatic, splanchnic, and somite mesoderm can be temporarily an epithel ...
Veterinary Developmental Anatomy Class Notes
... Dizygotic: fraternal twins result when two zygotes develop “independently” during the same pregnancy (independence can be compromised by fusion of fetal membranes and blood supplies). It is possible for fraternal blastomeres to merge and produce a single conceptus with two different genotypes (a chi ...
... Dizygotic: fraternal twins result when two zygotes develop “independently” during the same pregnancy (independence can be compromised by fusion of fetal membranes and blood supplies). It is possible for fraternal blastomeres to merge and produce a single conceptus with two different genotypes (a chi ...
CHAPTER 2
... divisions are called sympathetic and parasympathetic. The sympathetic system was the first part of the ANS to be discovered. Early workers noted its activity during emotional situations. Emotions were called sympathies, hence the name. Later, a second part of the nervous system that was also active ...
... divisions are called sympathetic and parasympathetic. The sympathetic system was the first part of the ANS to be discovered. Early workers noted its activity during emotional situations. Emotions were called sympathies, hence the name. Later, a second part of the nervous system that was also active ...
04 Early Development - Biology Courses Server
... It also implants into the uterine wall and initiates the development of the placenta. The focus of this section will be on the embryo. We will come back to the extraembryonic membranes and implantation in a later lecture. ...
... It also implants into the uterine wall and initiates the development of the placenta. The focus of this section will be on the embryo. We will come back to the extraembryonic membranes and implantation in a later lecture. ...
Taking a Brief Look to the Phylum Cnidaria
... In this paper we investigated some characteristics of the phylum Cnidaria as an animal phylum. We discussed about their body forms. We studied about cnidarians' skeletons and we also studied about their locomotion, nervous system and respiration. In this paper we investigated cnidarians' reproductio ...
... In this paper we investigated some characteristics of the phylum Cnidaria as an animal phylum. We discussed about their body forms. We studied about cnidarians' skeletons and we also studied about their locomotion, nervous system and respiration. In this paper we investigated cnidarians' reproductio ...
Chapter 10 Notes (Sections 1-4)
... They allow the cell cycle to proceed only once certain processes have happened inside the cell. External regulators are proteins that respond to events outside the cell. They direct cells to speed up or slow down the cell cycle. Growth factors are external regulators that stimulate the growth and di ...
... They allow the cell cycle to proceed only once certain processes have happened inside the cell. External regulators are proteins that respond to events outside the cell. They direct cells to speed up or slow down the cell cycle. Growth factors are external regulators that stimulate the growth and di ...
Lesson Overview
... THINK ABOUT IT The human body contains hundreds of different cell types, and every one of them develops from the single cell that starts the process. How do the cells get to be so different from each other? ...
... THINK ABOUT IT The human body contains hundreds of different cell types, and every one of them develops from the single cell that starts the process. How do the cells get to be so different from each other? ...
DEVELOPMENT OF NERVOUS SYSTEM 3rd week – neural plate
... These will make the cerebral hemispheres o Cavity of median part forms anterior part of 3rd ventricle Along choroid fissure, medial wall of cerebral hemisphere becomes thin o This later becomes the choroid plexus of lateral ventricle Cerebral hemispheres expand and cover, in order: o Diencephalon, ...
... These will make the cerebral hemispheres o Cavity of median part forms anterior part of 3rd ventricle Along choroid fissure, medial wall of cerebral hemisphere becomes thin o This later becomes the choroid plexus of lateral ventricle Cerebral hemispheres expand and cover, in order: o Diencephalon, ...
Did the ctenophore nervous system evolve independently?
... A proper answer to the question of whether the neural cell types in ctenophores, cnidarians, and bilaterians evolved from an ancient ancestor will require functional experiments in ctenophores. For instance, if knockouts of ctenophore genes orthologous to bilaterian synaptic genes lead to phenotypes ...
... A proper answer to the question of whether the neural cell types in ctenophores, cnidarians, and bilaterians evolved from an ancient ancestor will require functional experiments in ctenophores. For instance, if knockouts of ctenophore genes orthologous to bilaterian synaptic genes lead to phenotypes ...
Physics - BC Open Textbooks
... off and when to turn, as well as controlling the muscles throughout the body that make this complicated movement possible without knocking the bar down—all in just a few seconds. (credit: modification of work by Shane T. McCoy, U.S. Navy) This work is licensed under a Creative Commons Attribution 4. ...
... off and when to turn, as well as controlling the muscles throughout the body that make this complicated movement possible without knocking the bar down—all in just a few seconds. (credit: modification of work by Shane T. McCoy, U.S. Navy) This work is licensed under a Creative Commons Attribution 4. ...
![[Chapter 14] ANS consists of motor neurons that Innervate smooth](http://s1.studyres.com/store/data/000392613_1-5e27b58a24070d76c9283f016b06aa94-300x300.png)
[Chapter 14] ANS consists of motor neurons that Innervate smooth
... All ANS preganglionic axons All parasympathetic postganglionic axons at effector synapse Adrenergic fibers release neurotransmitter NE Most sympathetic postganglionic axons Exception: sympathetic postganglionic fibers secrete ACh at sweat ...
... All ANS preganglionic axons All parasympathetic postganglionic axons at effector synapse Adrenergic fibers release neurotransmitter NE Most sympathetic postganglionic axons Exception: sympathetic postganglionic fibers secrete ACh at sweat ...
Molecular Biology of the Cell
... Oocytes develop in stages from primordial germ cells (PGCs) that migrate into the developing gonad, where they become oogonia. After a period of mitotic proliferation, the oogonia begin meiosis I and are now called primary oocytes. Primary oocytes remain arrested after diplotene of prophase I for da ...
... Oocytes develop in stages from primordial germ cells (PGCs) that migrate into the developing gonad, where they become oogonia. After a period of mitotic proliferation, the oogonia begin meiosis I and are now called primary oocytes. Primary oocytes remain arrested after diplotene of prophase I for da ...
Chapter 2: Nerve Cells and Nerve Impulses
... A. contain the nucleus, ribosomes, and other structures found in most cells B. are branching fibers that get narrower near their ends C. is a thin fiber of constant diameter D. are an insulating material that cover an axon 55. The branching fibers that form the information-receiving pole of the nerv ...
... A. contain the nucleus, ribosomes, and other structures found in most cells B. are branching fibers that get narrower near their ends C. is a thin fiber of constant diameter D. are an insulating material that cover an axon 55. The branching fibers that form the information-receiving pole of the nerv ...
for neural fate
... Induction: Cells are instructed to adopt a fate by signals in the environment Competence: the ability of a cell to respond to a signal. It depends on the receptors, transcription factors, etc expressed by the cell Determination: A cell is restricted in its developmental potential. Differentiation: C ...
... Induction: Cells are instructed to adopt a fate by signals in the environment Competence: the ability of a cell to respond to a signal. It depends on the receptors, transcription factors, etc expressed by the cell Determination: A cell is restricted in its developmental potential. Differentiation: C ...
Autonomic nervous system
... belong to three categories with different effects on their target organs (see below “Function”): sympathetic, parasympathetic and enteric. Sympathetic ganglia are located in two sympathetic chains close to the spinal cord: the prevertebral and pre-aortic chains. Parasympathetic ganglia, in contrast, ...
... belong to three categories with different effects on their target organs (see below “Function”): sympathetic, parasympathetic and enteric. Sympathetic ganglia are located in two sympathetic chains close to the spinal cord: the prevertebral and pre-aortic chains. Parasympathetic ganglia, in contrast, ...
Chapter 10
... 24. The epidermis of a fluke has an outer layer called the __________, which forms a syncytium. A) plasmodium B) opisthaptor C) pellicle D) cuticle E) tegument ...
... 24. The epidermis of a fluke has an outer layer called the __________, which forms a syncytium. A) plasmodium B) opisthaptor C) pellicle D) cuticle E) tegument ...
Cleavage / Implantation
... Mental deficiency – mild-moderate Normal birth size – decreased growth rate Short stature / Obesity Very small hands, feet, genitalia Fair skin, blue eyes, sun-sensitivity Craniofacial – almond-shaped, narrow bifrontal diameter ...
... Mental deficiency – mild-moderate Normal birth size – decreased growth rate Short stature / Obesity Very small hands, feet, genitalia Fair skin, blue eyes, sun-sensitivity Craniofacial – almond-shaped, narrow bifrontal diameter ...
Cleavage Cleavage Cleavage Cleavage – Molecular Events Cell
... Mental deficiency – mild-moderate Normal birth size – decreased growth rate Short stature / Obesity Very small hands, feet, genitalia Fair skin, blue eyes, sun-sensitivity Craniofacial – almond-shaped, narrow bifrontal diameter ...
... Mental deficiency – mild-moderate Normal birth size – decreased growth rate Short stature / Obesity Very small hands, feet, genitalia Fair skin, blue eyes, sun-sensitivity Craniofacial – almond-shaped, narrow bifrontal diameter ...
Dopamine neuron responses to aversive stimuli (not so diverse after
... Although most dopamine neurons are inhibited by aversive stimuli, around 25% of dopamine neurons are excited by aversive stimuli. ...
... Although most dopamine neurons are inhibited by aversive stimuli, around 25% of dopamine neurons are excited by aversive stimuli. ...
Structural Organisation in Animals
... i) The compact bone consists of several structural units called Osteons or Haversian systems arranged around and parallel to the bone marrow cavities. ii) Haversian system consists of a Haversian canal that runs parallel to the marrow cavity. It contains an artery, a vein and a lymphatic vessel. Hav ...
... i) The compact bone consists of several structural units called Osteons or Haversian systems arranged around and parallel to the bone marrow cavities. ii) Haversian system consists of a Haversian canal that runs parallel to the marrow cavity. It contains an artery, a vein and a lymphatic vessel. Hav ...
29.1 How Organ Systems Communicate - Morales Biology
... – Responses can be chemical, cellular, or behavioral. – The nervous and endocrine systems respond to stimuli. ...
... – Responses can be chemical, cellular, or behavioral. – The nervous and endocrine systems respond to stimuli. ...
Nervous Tissue
... this is made more difficult in the nervous system because it goes everywhere, so also Whereabouts in the system am I? ...
... this is made more difficult in the nervous system because it goes everywhere, so also Whereabouts in the system am I? ...
Biology 30 Student Notes Nervous Reproduction_1
... shorter branched extensions of the cell body that receive incoming signals cell body contains the nucleus and most of the usual cell organelles clusters of cell bodies in the C.N.S. are called "nuclei"; make up the grey matter clusters outside the C.N.S. make "ganglia" ...
... shorter branched extensions of the cell body that receive incoming signals cell body contains the nucleus and most of the usual cell organelles clusters of cell bodies in the C.N.S. are called "nuclei"; make up the grey matter clusters outside the C.N.S. make "ganglia" ...
Sample PowerPoint Presentation
... Slide 7 is a good example of your advanced skills with PowerPoint. But more importantly, this is a great example of using animations and shapes to really zero in on a foundational concept that could mess students up later if they don't get it right. I wish I'd thought of this approach! ...
... Slide 7 is a good example of your advanced skills with PowerPoint. But more importantly, this is a great example of using animations and shapes to really zero in on a foundational concept that could mess students up later if they don't get it right. I wish I'd thought of this approach! ...
Neuronal self-avoidance
Neuronal self-avoidance, or isoneural avoidance, is an important property of neurons which consists in the tendency of branches (dendrites and axons) arising from a single soma (also called isoneuronal or sister branches) to turn away from one another. The arrangements of branches within neuronal arbors are established during development and result in minimal crossing or overlap as they spread over a territory, resulting in the typical fasciculated morphology of neurons (Fig 1).In opposition, branches from different neurons can overlap freely with one another. This propriety demands that neurons are able to discriminate “self,” which they avoid, from “non-self” branches, with which they coexist. This neuronal self-recognition is attained through families of cell recognition molecules which work as individual barcodes, allowing the discrimination of any other nearby branch as either “self” or “non-self”.Self-avoidance ensures that dendritic territories are covered completely and yet non-redundantly guaranteeing that branches achieve functionally appropriate coverage of input or output territories.Neuronal communication requires the coordinated assembly of axons, dendrites, and synapses. Therefore, self-avoidance is necessary for proper neuronal wiring and postnatal development and, together with Neuronal tiling (heteroneuronal avoidance), is a crucial spacing mechanism for patterning neural circuits that results in complete and nonredundant innervation of sensory or synaptic space.