Marginal zone cells-the primitive streak
... first approach was the comparison of the differentiation of stage-XHI E.G & K blastoderms following different types of operation procedures (Table 1). The group subjected to type-I procedure merely confirms that the removal of the primary hypoblast without any further interference does not affect ax ...
... first approach was the comparison of the differentiation of stage-XHI E.G & K blastoderms following different types of operation procedures (Table 1). The group subjected to type-I procedure merely confirms that the removal of the primary hypoblast without any further interference does not affect ax ...
Human Immune System
... – oval-shaped or bean-shaped structures – Some are as small as a pinhead and others as large as a lima bean – When an infection is present, germinal centers form and the node begins to release lymphocytes – The center or medulla of a lymph node is composed of sinuses and cords. ...
... – oval-shaped or bean-shaped structures – Some are as small as a pinhead and others as large as a lima bean – When an infection is present, germinal centers form and the node begins to release lymphocytes – The center or medulla of a lymph node is composed of sinuses and cords. ...
tissue lecture - Suffolk County Community College
... -appear striated: actin and myosin organized into myofibrils -some satellite cells (stem cells) present for minor repair after injury Location: skeletal muscles (“meat”) Functions: -move skeleton -guard entrances/exits -generate heat ...
... -appear striated: actin and myosin organized into myofibrils -some satellite cells (stem cells) present for minor repair after injury Location: skeletal muscles (“meat”) Functions: -move skeleton -guard entrances/exits -generate heat ...
Animal Development
... Figures and images by N. Wheat unless otherwise noted. Starfish embryo photos courtesy of K. Wynne. Sea urchin gastrulation, and frog cleavage & gastrulation videos courtesy of TheDeepSci’s YouTube channel. Chick gastrulation video courtesy of elishanathan’s YouTube channel. ...
... Figures and images by N. Wheat unless otherwise noted. Starfish embryo photos courtesy of K. Wynne. Sea urchin gastrulation, and frog cleavage & gastrulation videos courtesy of TheDeepSci’s YouTube channel. Chick gastrulation video courtesy of elishanathan’s YouTube channel. ...
Biology - The Buckingham School
... Rough endoplasmic reticulum Smooth endoplasmic reticulum Golgi apparatus Ribosomes Mitochondria Lysosomes Chloroplast Plasma membrane Centrioles ...
... Rough endoplasmic reticulum Smooth endoplasmic reticulum Golgi apparatus Ribosomes Mitochondria Lysosomes Chloroplast Plasma membrane Centrioles ...
Investigation 4
... into the large intestine where it is eaten by billions of harmless bacteria and mixed with dead cells to form solid feces. Finally water is reabsorbed into the body which the feces are moved into the rectum to await expulsion. (lovely.) Other organs that play important roles in digestion include th ...
... into the large intestine where it is eaten by billions of harmless bacteria and mixed with dead cells to form solid feces. Finally water is reabsorbed into the body which the feces are moved into the rectum to await expulsion. (lovely.) Other organs that play important roles in digestion include th ...
Chapter 16 Lecture Outline A. gustation
... bipolar cells - superficial to photoreceptors, connect photoreceptors to ganglion cells ganglion cells - surface of nervous layer; axons form cranial nerve II (optic nerve) anterior margin of nervous layer = ora serrata macula lutea - spot in exact center of back of eyeball fovea centralis - indenta ...
... bipolar cells - superficial to photoreceptors, connect photoreceptors to ganglion cells ganglion cells - surface of nervous layer; axons form cranial nerve II (optic nerve) anterior margin of nervous layer = ora serrata macula lutea - spot in exact center of back of eyeball fovea centralis - indenta ...
Kingdom Animalia Notes Ch 26-29 General Characteristics
... • _____________ (middle germ layer): gives rise to muscles, circulatory, reproductive and excretory systems • _____________ (outermost germ layer): gives rise to sensory organs, nerves, integumentary system (skin, hair, nails, etc.) Porifera • Hollow tube body plan: _____________– no coelom • Contai ...
... • _____________ (middle germ layer): gives rise to muscles, circulatory, reproductive and excretory systems • _____________ (outermost germ layer): gives rise to sensory organs, nerves, integumentary system (skin, hair, nails, etc.) Porifera • Hollow tube body plan: _____________– no coelom • Contai ...
Digestive System
... Then it goes through the larynx (voice box) and then into the trachea (windpipe) The trachea splits into two bronchi (air tubes that connect the trachea to the lungs) which then split into finer tubes called bronchioles. Each bronchiole has a grapelike cluster of air sacs at the end of it called alv ...
... Then it goes through the larynx (voice box) and then into the trachea (windpipe) The trachea splits into two bronchi (air tubes that connect the trachea to the lungs) which then split into finer tubes called bronchioles. Each bronchiole has a grapelike cluster of air sacs at the end of it called alv ...
File
... fossil record: a natural history of living organisms as determined from fossils. fossils: the remains or impressions in the earth of once living organisms. gamete: the sex cell of an organism, such as the sperm or egg. gastric pouches: the pouch-like portions of a jellyfish’s gastrovascular cavity w ...
... fossil record: a natural history of living organisms as determined from fossils. fossils: the remains or impressions in the earth of once living organisms. gamete: the sex cell of an organism, such as the sperm or egg. gastric pouches: the pouch-like portions of a jellyfish’s gastrovascular cavity w ...
Blood chapter powerpoint
... Hematopoiesis – process by which blood cells are formed 100 billion new blood cells formed each day Takes place in the red bone marrow of the humerus, femur, sternum, ribs, vertebra and pelvis ...
... Hematopoiesis – process by which blood cells are formed 100 billion new blood cells formed each day Takes place in the red bone marrow of the humerus, femur, sternum, ribs, vertebra and pelvis ...
Blood
... Hematopoiesis – process by which blood cells are formed 100 billion new blood cells formed each day Takes place in the red bone marrow of the humerus, femur, sternum, ribs, vertebra and pelvis ...
... Hematopoiesis – process by which blood cells are formed 100 billion new blood cells formed each day Takes place in the red bone marrow of the humerus, femur, sternum, ribs, vertebra and pelvis ...
Ear
... first pharyngeal arch, and the stapes is derived from that of the second arch Although the ossicles appear during the first half of fetal life, they remain embedded in mesenchyme until the eighth month ,when the surrounding tissue dissolves. ...
... first pharyngeal arch, and the stapes is derived from that of the second arch Although the ossicles appear during the first half of fetal life, they remain embedded in mesenchyme until the eighth month ,when the surrounding tissue dissolves. ...
Levels of Organization
... • for atoms with atomic numbers of 18 or less, the following rules apply: • the first shell can hold up to 2 electrons • the second shell can hold up to 8 electrons • the third shell can hold up to 8 electrons ...
... • for atoms with atomic numbers of 18 or less, the following rules apply: • the first shell can hold up to 2 electrons • the second shell can hold up to 8 electrons • the third shell can hold up to 8 electrons ...
Online Science League A Division of AcademicLeagues.com Sixth
... 1. C (Blood enters the heart from the body through the vena cava. The blood is then sent to the lungs through the pulmonary arteries. The oxygen-rich blood returns to the heart through the pulmonary veins, and is pumped out to the body through the aorta. For a better look at the heart, check out www ...
... 1. C (Blood enters the heart from the body through the vena cava. The blood is then sent to the lungs through the pulmonary arteries. The oxygen-rich blood returns to the heart through the pulmonary veins, and is pumped out to the body through the aorta. For a better look at the heart, check out www ...
Levels of Organization
... body. Blood, fat, ligaments, cartilage, bones, and tendons are all connective tissues. ...
... body. Blood, fat, ligaments, cartilage, bones, and tendons are all connective tissues. ...
Simple Invertebrates1
... particles stick to the collar cells. The trapped particles are then engulfed by the collar cells where they may be digested. If the collar cells do not digest the food, they pass it on to the amebocytes. When the amebocytes are finished digesting the ...
... particles stick to the collar cells. The trapped particles are then engulfed by the collar cells where they may be digested. If the collar cells do not digest the food, they pass it on to the amebocytes. When the amebocytes are finished digesting the ...
Discovery Lab - Summit Hill Elementary PTO
... extend itself forward holding on with its setae, and lift itself up by anchoring its back setae. Worms can regenerate some lost or injured parts depending on where it was cut. The tail can grow back. But a tail cannot grow a new head. ...
... extend itself forward holding on with its setae, and lift itself up by anchoring its back setae. Worms can regenerate some lost or injured parts depending on where it was cut. The tail can grow back. But a tail cannot grow a new head. ...
What Makes Up Your Body?
... of your body are made of cells. Cells are the smallest part of a living thing. They are calltrd the building blocks of the body. Billions ofcells make up yoLrr body. You have blood cells and skin cells. You have bone cells and nerve cells. You have muscle cells, too. Each of these diffelent kinds of ...
... of your body are made of cells. Cells are the smallest part of a living thing. They are calltrd the building blocks of the body. Billions ofcells make up yoLrr body. You have blood cells and skin cells. You have bone cells and nerve cells. You have muscle cells, too. Each of these diffelent kinds of ...
Fall 2013 Exam Review Review Which statement best describes
... 44. Put the level of organization in order from smallest to largest. a. Organ system, organ tissues, and cells b. Cells, organs, tissues, and organ systems c. Organs, tissues, cells, and organ systems d. Cells, tissues, organs, and organ systems 45. What chemical digestion action occurs in the mout ...
... 44. Put the level of organization in order from smallest to largest. a. Organ system, organ tissues, and cells b. Cells, organs, tissues, and organ systems c. Organs, tissues, cells, and organ systems d. Cells, tissues, organs, and organ systems 45. What chemical digestion action occurs in the mout ...
Basis of Cell Structure and Function
... • Cells can’t be infinitely small • They must be at least large enough to contain macromolecules (proteins and nucleic acids – DNA) that are necessary to sustain life. • Cells can’t be infinitely large • 1. Cells must be small enough for the nucleus to control cellular activities. The largest cells ...
... • Cells can’t be infinitely small • They must be at least large enough to contain macromolecules (proteins and nucleic acids – DNA) that are necessary to sustain life. • Cells can’t be infinitely large • 1. Cells must be small enough for the nucleus to control cellular activities. The largest cells ...
Blood Cell Formation
... Protect the body from infectious microorganisms Function outside the bloodstream in loose connective tissue Diapedesis—circulating leukocytes leave the capillaries Originate in bone marrow ...
... Protect the body from infectious microorganisms Function outside the bloodstream in loose connective tissue Diapedesis—circulating leukocytes leave the capillaries Originate in bone marrow ...
Ch. 27 Invertebrates
... Filarial worms - live in the blood or tissues - carried by mosquitoes - can lead to elephantitis in humans - other types are dog heartworms - can weaken the heart and eventually kill the animal ...
... Filarial worms - live in the blood or tissues - carried by mosquitoes - can lead to elephantitis in humans - other types are dog heartworms - can weaken the heart and eventually kill the animal ...
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.