Characteristics of Animals
... All cells are roughly the same size, regardless of the size of the animal Similar cells are organized into functional groups called tissues ...
... All cells are roughly the same size, regardless of the size of the animal Similar cells are organized into functional groups called tissues ...
Document
... many similarities with mammals the acrosomal reaction is triggered when the sperm meets the egg binding of the sperm to a receptor on the egg triggers this reaction – 1. docking onto the jelly layer activates the acrosome at the tip of the sperm – 2. acrosome releases hydrolytic enzymes that digest ...
... many similarities with mammals the acrosomal reaction is triggered when the sperm meets the egg binding of the sperm to a receptor on the egg triggers this reaction – 1. docking onto the jelly layer activates the acrosome at the tip of the sperm – 2. acrosome releases hydrolytic enzymes that digest ...
Ch 42 Human Reproduction
... blastocyst. The blastocyst contains an inner mass of cells and an outer layer of cells called the trophoblast The inner cell mass forms the three primary cell layers ectoderm, mesoderm, endoderm. Each primary cell layer gives rise to specific new tissues and organs. The ectoderm forms skin epidermis ...
... blastocyst. The blastocyst contains an inner mass of cells and an outer layer of cells called the trophoblast The inner cell mass forms the three primary cell layers ectoderm, mesoderm, endoderm. Each primary cell layer gives rise to specific new tissues and organs. The ectoderm forms skin epidermis ...
lecture presentations
... • Blastula – hollow ball of cells (trophoblast) surrounding an inner cell mass at one end and a blastocoel at the other – found in amniotes – animals that make an egg with an amniotic cavity • e.g. frogs, chickens ...
... • Blastula – hollow ball of cells (trophoblast) surrounding an inner cell mass at one end and a blastocoel at the other – found in amniotes – animals that make an egg with an amniotic cavity • e.g. frogs, chickens ...
Development of somites
... • The somites give rise to most of the axial skeleton, associated musculature and the dermis of the skin. • During the somite period, the somites are used as one of the criteria for determining the embryo’s age. ...
... • The somites give rise to most of the axial skeleton, associated musculature and the dermis of the skin. • During the somite period, the somites are used as one of the criteria for determining the embryo’s age. ...
Take it Home Tuesday #8 Name
... Carries oxygen from the lungs to all other body cells, as well as carbon dioxide from the cells back to the lungs. Molecules used to determine blood type. ...
... Carries oxygen from the lungs to all other body cells, as well as carbon dioxide from the cells back to the lungs. Molecules used to determine blood type. ...
Multicellular Organisms - Thomas A. Stewart Secondary School
... All multicellular organisms begin as stem cells. These are unspecialized cells capable of developing into many different types of cell. Stem cells found in embryos are called embryonic stem cells and develop into all the different types of cell in the body. In the earliest stages of development, ste ...
... All multicellular organisms begin as stem cells. These are unspecialized cells capable of developing into many different types of cell. Stem cells found in embryos are called embryonic stem cells and develop into all the different types of cell in the body. In the earliest stages of development, ste ...
Cardiovascular System
... Cells are the basic unit of structure and function In all living cells Human cells have characteristics for carrying out special functions ...
... Cells are the basic unit of structure and function In all living cells Human cells have characteristics for carrying out special functions ...
Embryonic Adaptations
... The development of the allantois varies greatly in mammals. Generally, the allantois develops as an diverticulum of the hind gut and comes to lie next to the chorion. The primary function of the allantois in mammals is gas exchange, because the urea waste from the embryo is passed into the maternal ...
... The development of the allantois varies greatly in mammals. Generally, the allantois develops as an diverticulum of the hind gut and comes to lie next to the chorion. The primary function of the allantois in mammals is gas exchange, because the urea waste from the embryo is passed into the maternal ...
Organogenesis Mesoderm - Relative Positions of Different Types
... Ectoderm - Dorsoventral Patterning of Neural Tube ...
... Ectoderm - Dorsoventral Patterning of Neural Tube ...
PPT - UCLA Health
... Enlarged vestibular aqueduct, defined as a diameter larger than 1.5 mm at the vestibular aqueduct midpoint ...
... Enlarged vestibular aqueduct, defined as a diameter larger than 1.5 mm at the vestibular aqueduct midpoint ...
Exam 3 Review - Iowa State University
... C) It prolongs embryonic development D) It permits internal fertilization to be replaced by external fertilization 27.) To what structure are the scales of chondrichthyans most closely related? A) osteicthyan scales B) reptilan scales C) mammalian fur D) bird scales E) chondricthyan teeth ...
... C) It prolongs embryonic development D) It permits internal fertilization to be replaced by external fertilization 27.) To what structure are the scales of chondrichthyans most closely related? A) osteicthyan scales B) reptilan scales C) mammalian fur D) bird scales E) chondricthyan teeth ...
Part A
... embryo is now receiving its nutrition via the umbilical vessels that connect it (through the umbilical cord) to the placenta. Copyright © 2010 Pearson Education, Inc. ...
... embryo is now receiving its nutrition via the umbilical vessels that connect it (through the umbilical cord) to the placenta. Copyright © 2010 Pearson Education, Inc. ...
Level Of Organisation
... efficient if the tissue is made up of many small cells rather than fewer larger cells. ...
... efficient if the tissue is made up of many small cells rather than fewer larger cells. ...
- Smart Science
... length and was laid by an animal that is now extinct: the Elephant Bird of Madagascar. ...
... length and was laid by an animal that is now extinct: the Elephant Bird of Madagascar. ...
Histology
... 1. cell – basic unit; many types; dozens to hundreds of types in most adult vertebrates 2. tissue – a group of cells similar in structure and function • most differentiate early in development from three embryonic germ layers § endoderm (innermost) § mesoderm § ectoderm • four primary tissues in ...
... 1. cell – basic unit; many types; dozens to hundreds of types in most adult vertebrates 2. tissue – a group of cells similar in structure and function • most differentiate early in development from three embryonic germ layers § endoderm (innermost) § mesoderm § ectoderm • four primary tissues in ...
Components, Characteristics, functions of blood investigation 1
... Hematocrit - percentage by VOLUME of erythrocytes when blood is centrifuged (normal = 45%) C. Characteristics of Blood ...
... Hematocrit - percentage by VOLUME of erythrocytes when blood is centrifuged (normal = 45%) C. Characteristics of Blood ...
CELL
... constant component of plant cells. Next, the nuclei were also observed and recognized as such in some animal cells. •Finally, a living substance called PROTOPLASM was ...
... constant component of plant cells. Next, the nuclei were also observed and recognized as such in some animal cells. •Finally, a living substance called PROTOPLASM was ...
Levels of Organization
... perform a job is called tissue. • Tissues are made of cell woven together. ...
... perform a job is called tissue. • Tissues are made of cell woven together. ...
Animal Tissue
... • These cells function in involuntary movements and/or autonomic responses (such as breathing, secretion, ejaculation, birth, and certain reflexes). • spindle shaped cells that form masses. These fibers are components of structures in the digestive system, reproductive tract, and blood vessels. ...
... • These cells function in involuntary movements and/or autonomic responses (such as breathing, secretion, ejaculation, birth, and certain reflexes). • spindle shaped cells that form masses. These fibers are components of structures in the digestive system, reproductive tract, and blood vessels. ...
Overview of Systems, tissues Notes
... • Tissue: similar cells that perform a common function • Organ: structure made of two or more types of tissue that together perform a specific task • Organ system: multiple organs that together perform a vital body function ...
... • Tissue: similar cells that perform a common function • Organ: structure made of two or more types of tissue that together perform a specific task • Organ system: multiple organs that together perform a vital body function ...
Body Cavities
... and lateral plate mesoderm that is involved in forming the body cavity . • Soon after it forms as a solid mesodermal layer, clefts appear in the lateral plate mesoderm that coalesce to split the solid layer into two: (a) parietal (somatic) layer adjacent to the surface ectoderm and continuous with t ...
... and lateral plate mesoderm that is involved in forming the body cavity . • Soon after it forms as a solid mesodermal layer, clefts appear in the lateral plate mesoderm that coalesce to split the solid layer into two: (a) parietal (somatic) layer adjacent to the surface ectoderm and continuous with t ...
chapter 1 book 2 Sponges, Cnidarians
... • Reproduce both asexually and sexually • Polyps: asexual (budding is most common) • Sexual: some produce both male and female sex cells; some are specifically male or female ...
... • Reproduce both asexually and sexually • Polyps: asexual (budding is most common) • Sexual: some produce both male and female sex cells; some are specifically male or female ...
Human embryogenesis
Human embryogenesis is the process of cell division and cellular differentiation of the embryo that occurs during the early stages of development. In biological terms, human development entails growth from a one celled zygote to an adult human being. Fertilisation occurs when the sperm cell successfully enters and fuses with an egg cell (ovum). The genetic material of the sperm and egg then combine to form a single cell called a zygote and the germinal stage of prenatal development commences. Embryogenesis covers the first eight weeks of development and at the beginning of the ninth week the embryo is termed a fetus.Human embryology is the study of this development during the first eight weeks after fertilisation. The normal period of gestation (pregnancy) is nine months or 38 weeks.The germinal stage, refers to the time from fertilization, through the development of the early embryo until implantation is completed in the uterus. The germinal stage takes around 10 days.During this stage, the zygote, which is defined as an embryo because it contains a full complement of genetic material, begins to divide, in a process called cleavage. A blastocyst is then formed and implanted in the uterus. Embryogenesis continues with the next stage of gastrulation when the three germ layers of the embryo form in a process called histogenesis, and the processes of neurulation and organogenesis follow. The embryo is referred to as a fetus in the later stages of prenatal development, usually taken to be at the beginning of the ninth week. In comparison to the embryo, the fetus has more recognizable external features, and a more complete set of developing organs. The entire process of embryogenesis involves coordinated spatial and temporal changes in gene expression, cell growth and cellular differentiation. A nearly identical process occurs in other species, especially among chordates.