Porifera and Cnidaria
... embryologically these tissue layers are ectoderm, mesoderm and endoderm. 3. Body cavity. Is a body cavity present? A body cavity – the space between the gut and the body wall – is present only in three-layered organisms, that is, in organisms with the embryonic germ layers ectoderm, mesoderm and end ...
... embryologically these tissue layers are ectoderm, mesoderm and endoderm. 3. Body cavity. Is a body cavity present? A body cavity – the space between the gut and the body wall – is present only in three-layered organisms, that is, in organisms with the embryonic germ layers ectoderm, mesoderm and end ...
The Sensory System I. Receptors - Sensory receptors found in the
... 3) Superior _____________ - rotates eye _________________ Inferior _____________ - rotates eye__________________ b. Structures of the Eye 1) ________________ - white outer layer - for protection a) ____________ - transparent outer layer - refracts light 2) ________________ - middle layer - absorbs s ...
... 3) Superior _____________ - rotates eye _________________ Inferior _____________ - rotates eye__________________ b. Structures of the Eye 1) ________________ - white outer layer - for protection a) ____________ - transparent outer layer - refracts light 2) ________________ - middle layer - absorbs s ...
chapter3_Cells - Moore Middle School
... • A group of organs working together to perform a particular function is called an organ system. Each organ system has a specific job in the body. • Examples of organ systems are the digestive system, the respiratory system, and the cardiovascular system. • Examples of plant organ systems are leaf s ...
... • A group of organs working together to perform a particular function is called an organ system. Each organ system has a specific job in the body. • Examples of organ systems are the digestive system, the respiratory system, and the cardiovascular system. • Examples of plant organ systems are leaf s ...
Chapter 3 - Cobb Learning
... • As a cell’s volume increases, its surface area grows. But volume increases faster than the surface area. • The area of a cell’s surface–compared with the cell’s volume–limits the cell’s size. • The ratio of the cell’s outer surface to the cell’s volume is called the surface area-to-volume ratio: ...
... • As a cell’s volume increases, its surface area grows. But volume increases faster than the surface area. • The area of a cell’s surface–compared with the cell’s volume–limits the cell’s size. • The ratio of the cell’s outer surface to the cell’s volume is called the surface area-to-volume ratio: ...
Chapter 3
... • A group of organs working together to perform a particular function is called an organ system. Each organ system has a specific job in the body. • Examples of organ systems are the digestive system, the respiratory system, and the cardiovascular system. • Examples of plant organ systems are leaf s ...
... • A group of organs working together to perform a particular function is called an organ system. Each organ system has a specific job in the body. • Examples of organ systems are the digestive system, the respiratory system, and the cardiovascular system. • Examples of plant organ systems are leaf s ...
L1&2-Final heart dev..
... • The heart is the first functional organ to develop. • It develops from splanchnic mesoderm in the wall of the yolk sac (cardiogenic area), cranial to the developing mouth & nervous system and ventral to the developing pericardial sac. • The heart primordium is first evident at 18 days (as an angio ...
... • The heart is the first functional organ to develop. • It develops from splanchnic mesoderm in the wall of the yolk sac (cardiogenic area), cranial to the developing mouth & nervous system and ventral to the developing pericardial sac. • The heart primordium is first evident at 18 days (as an angio ...
Chapter 17: The Special Senses
... The fluid aqueous humor circulates within the eye and reenters the circulation after diffusing through the walls of the anterior chamber and into the canal of Schlemm. Fluid pressure in the aqueous humor (intraocular pressure) helps retain the eye’s shape. ...
... The fluid aqueous humor circulates within the eye and reenters the circulation after diffusing through the walls of the anterior chamber and into the canal of Schlemm. Fluid pressure in the aqueous humor (intraocular pressure) helps retain the eye’s shape. ...
02DEVELOPMENTOF_FEMALE_GENITAL_SYSTEM_(11).
... (The X chromosome has genes for ovarian development) The type of gonad determines the type of sexual differentiation in the Sexual Ducts and External Genitalia. ...
... (The X chromosome has genes for ovarian development) The type of gonad determines the type of sexual differentiation in the Sexual Ducts and External Genitalia. ...
Histology - take homes from lectures 2012
... o Oxyphil cells – differentiate during puberty, no known secretory role o Principal cells (chief cells) – differentiate during embryological development, stimulated by changes in Ca2+ in blood stream – produce PTH (raises blood calcium levels by resorbing bone) Adrenal glands – embedded in perirenal ...
... o Oxyphil cells – differentiate during puberty, no known secretory role o Principal cells (chief cells) – differentiate during embryological development, stimulated by changes in Ca2+ in blood stream – produce PTH (raises blood calcium levels by resorbing bone) Adrenal glands – embedded in perirenal ...
Callyspongia plicifera
... • None/VERY simple • They may close their ostia if there is too much matter in the water or if it has been touched. ...
... • None/VERY simple • They may close their ostia if there is too much matter in the water or if it has been touched. ...
![[1] The stage of development characterized by a hollow ball of cells](http://s1.studyres.com/store/data/009786115_1-65ed6b625567c1fd2b9e40812e689270-300x300.png)
[1] The stage of development characterized by a hollow ball of cells
... 14. Discuss current ideas of the evolutionary history of man. In doing so, describe some of the anatomical changes that occurred in the course of evolution from ape ancestor to modern human, and discuss the roles that bipedalism, tool use, and increased brain size may have played in human evolution. ...
... 14. Discuss current ideas of the evolutionary history of man. In doing so, describe some of the anatomical changes that occurred in the course of evolution from ape ancestor to modern human, and discuss the roles that bipedalism, tool use, and increased brain size may have played in human evolution. ...
lnternal morphology and histology of the fish mite
... and projects slightly into the lumen as in other acarines. The wall of the oesophagus is roughly triangular in cross section and completely fills the foramen within the brain even when empty. It is formed of an outer tunic and an inner chitinous tube. The wall appears to be slightly thickened for th ...
... and projects slightly into the lumen as in other acarines. The wall of the oesophagus is roughly triangular in cross section and completely fills the foramen within the brain even when empty. It is formed of an outer tunic and an inner chitinous tube. The wall appears to be slightly thickened for th ...
Life Science
... Background Information: The Greek word “cnidos” means “stinging nettle,” and that’s how the Phylum Cnidaria got its name and definition. Cnidarians are characterized by stinging cells called nematocysts or cnidocysts, which when disturbed or hunting prey eject a barbed thread and often poison as wel ...
... Background Information: The Greek word “cnidos” means “stinging nettle,” and that’s how the Phylum Cnidaria got its name and definition. Cnidarians are characterized by stinging cells called nematocysts or cnidocysts, which when disturbed or hunting prey eject a barbed thread and often poison as wel ...
2.2 Adaptations for Gas Exchange
... gas exchange occurs through diffusion as they have permeable moist skin which acts as a respiratory surface. • Tadpoles have gills for use in water. ...
... gas exchange occurs through diffusion as they have permeable moist skin which acts as a respiratory surface. • Tadpoles have gills for use in water. ...
1 • The ear ( vestibulo-acoustic organs ) consists of vestibular
... inner tunnel (T). This space is continuous throughout the length of the cochlea and is bounded below by thin lateral extensions of the base of the pillar cells that rest on the basilar lamina. It is bounded above by the converging cylindrical bodies of the inner and outer pillar cells. The most dist ...
... inner tunnel (T). This space is continuous throughout the length of the cochlea and is bounded below by thin lateral extensions of the base of the pillar cells that rest on the basilar lamina. It is bounded above by the converging cylindrical bodies of the inner and outer pillar cells. The most dist ...
Invertebrates Notes
... blocked by filarial worms. Here the left leg is swollen with the fluids accumulated in the tissues as a result of the blockage. ...
... blocked by filarial worms. Here the left leg is swollen with the fluids accumulated in the tissues as a result of the blockage. ...
Histology Presentation
... • Some epithelia are richly innervated to detect changes in the environment at that body or organ surface. • Most nervous tissue is in the underlying ...
... • Some epithelia are richly innervated to detect changes in the environment at that body or organ surface. • Most nervous tissue is in the underlying ...
Word Roots - Jennifer`s e
... Intro. to Marine Biology primarily cause the ventricles to contract) auto- = self (autonomic nervous system: a subdivision of the motor nervous system of vertebrates that regulates the internal environment) auto- = self (autosome: the chromosomes that do not determine gender) auto- = self; poly- = m ...
... Intro. to Marine Biology primarily cause the ventricles to contract) auto- = self (autonomic nervous system: a subdivision of the motor nervous system of vertebrates that regulates the internal environment) auto- = self (autosome: the chromosomes that do not determine gender) auto- = self; poly- = m ...
Lecture 2
... The contact of the uterovaginal primordium with the urogenital sinus induces formation of two SinoVaginal Bulbs. The bulbs proliferate and fuse to form a solid Vaginal Plate. The central cells of the vaginal plate break down to form the lumen of the vagina. ...
... The contact of the uterovaginal primordium with the urogenital sinus induces formation of two SinoVaginal Bulbs. The bulbs proliferate and fuse to form a solid Vaginal Plate. The central cells of the vaginal plate break down to form the lumen of the vagina. ...
Animal Kingdom Test #1 - Parma City School District
... a) a hollow space in the body cavity b) the digestive tract c) a class for Flatworms d) an internal organ e) a structure associated with the nervous system in Flatworms 26. What type of symmetry does the Planaria exhibit? a) radial b) asymmetry c) bilateral d) geometric e) isolateral 27. The evoluti ...
... a) a hollow space in the body cavity b) the digestive tract c) a class for Flatworms d) an internal organ e) a structure associated with the nervous system in Flatworms 26. What type of symmetry does the Planaria exhibit? a) radial b) asymmetry c) bilateral d) geometric e) isolateral 27. The evoluti ...
the human body
... cord which provides the connection between the brain and the extremities and well as the region of the body associated ...
... cord which provides the connection between the brain and the extremities and well as the region of the body associated ...
Describe the function of red blood cells.
... actual blood donation process, your blood is drawn through a needle placed in a vein in one arm. Then a special machine separates the plasma (and often the platelets) from your blood sample. This process is called plasmapheresis. The remaining red blood cells and other blood components are then retu ...
... actual blood donation process, your blood is drawn through a needle placed in a vein in one arm. Then a special machine separates the plasma (and often the platelets) from your blood sample. This process is called plasmapheresis. The remaining red blood cells and other blood components are then retu ...
Big Idea 14 : Organization and Development of Living Organisms
... As living things become older, ...
... As living things become older, ...
Human Body Systems - New Hartford Central Schools
... initially part of the blood, but as blood flows through the body, lymph leaks out, taking hazardous substances with it and filtering these substances through the lymph nodes, which trap these ...
... initially part of the blood, but as blood flows through the body, lymph leaks out, taking hazardous substances with it and filtering these substances through the lymph nodes, which trap these ...
patternsinnature
... cholesterol, carbohydrates, glycoproteins, phospholipids and proteins. These structures in turn all have a specialised function. These functions account for the movement of some substances into and out of cells. - The phospholipid bilayer acts as a barrier to ions, polar substances and large molecul ...
... cholesterol, carbohydrates, glycoproteins, phospholipids and proteins. These structures in turn all have a specialised function. These functions account for the movement of some substances into and out of cells. - The phospholipid bilayer acts as a barrier to ions, polar substances and large molecul ...
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.