Animal phylogeny in the light of the trochaea theory
... junctions have been reported both from calcareans and demosponges (Green & Bergquist, 1979) and from hexactinellids (Mackie & Singla, 1983), but gap junctions (see Unwin & Zampighi, 1980) have not been observed (Mackie & Singla, 1983). An extracellular matrix contains collagenous fibres, but a basal ...
... junctions have been reported both from calcareans and demosponges (Green & Bergquist, 1979) and from hexactinellids (Mackie & Singla, 1983), but gap junctions (see Unwin & Zampighi, 1980) have not been observed (Mackie & Singla, 1983). An extracellular matrix contains collagenous fibres, but a basal ...
Physiology of red blood cells and haemoglobin variants - e
... develop into erythroblasts, at which point they start to synthesise haemoglobin. Mature erythrocytes are biconcave discs measuring 7.5 m (microns or thousandths of a millimetre) in diameter. Their thick outer rim measures 2.5µm and their thinner centre only 1 m. The shape of the disc confers three i ...
... develop into erythroblasts, at which point they start to synthesise haemoglobin. Mature erythrocytes are biconcave discs measuring 7.5 m (microns or thousandths of a millimetre) in diameter. Their thick outer rim measures 2.5µm and their thinner centre only 1 m. The shape of the disc confers three i ...
Human Anatomy and Physiology I /Lab
... 2. Describe living organisms by characteristics they have and factors needed to maintain living organisms and describe body organization; serous membranes; cavities; compartmentalization in the human body. Describe all organ systems we study in API by main organs and functions. Discuss the relations ...
... 2. Describe living organisms by characteristics they have and factors needed to maintain living organisms and describe body organization; serous membranes; cavities; compartmentalization in the human body. Describe all organ systems we study in API by main organs and functions. Discuss the relations ...
Adobe Acrobat Version
... • As they function, our cells use oxygen and produce carbon dioxide. • The respiratory system brings the needed oxygen into and eliminates carbon dioxide from the body by working closely with the cardiovascular system. • The blood transports these gases, carrying oxygen to the tissues and carbon dio ...
... • As they function, our cells use oxygen and produce carbon dioxide. • The respiratory system brings the needed oxygen into and eliminates carbon dioxide from the body by working closely with the cardiovascular system. • The blood transports these gases, carrying oxygen to the tissues and carbon dio ...
MS Word Version
... • As they function, our cells use oxygen and produce carbon dioxide. • The respiratory system brings the needed oxygen into and eliminates carbon dioxide from the body by working closely with the cardiovascular system. • The blood transports these gases, carrying oxygen to the tissues and carbon dio ...
... • As they function, our cells use oxygen and produce carbon dioxide. • The respiratory system brings the needed oxygen into and eliminates carbon dioxide from the body by working closely with the cardiovascular system. • The blood transports these gases, carrying oxygen to the tissues and carbon dio ...
Anatomy Review: Respiratory Structures
... • As they function, our cells use oxygen and produce carbon dioxide. • The respiratory system brings the needed oxygen into and eliminates carbon dioxide from the body by working closely with the cardiovascular system. • The blood transports these gases, carrying oxygen to the tissues and carbon dio ...
... • As they function, our cells use oxygen and produce carbon dioxide. • The respiratory system brings the needed oxygen into and eliminates carbon dioxide from the body by working closely with the cardiovascular system. • The blood transports these gases, carrying oxygen to the tissues and carbon dio ...
EXCRETION
... from the body through a special structure called the excretory organ. Specifically, the act of excretion is a two-fold function: it eliminates substances that have reached their threshold concentration in the blood, and it retains or reabsorbs substances that are below this concentration. Both funct ...
... from the body through a special structure called the excretory organ. Specifically, the act of excretion is a two-fold function: it eliminates substances that have reached their threshold concentration in the blood, and it retains or reabsorbs substances that are below this concentration. Both funct ...
A primer on the mouse basal body
... bodies of both motile and immotile cilia, such as photoreceptor cells. In this cell type, the rootlet extends from the outer segment, a highly specialized modified cilium, to the synaptic terminal at the opposite end of the cell [48, 49]. One component of the rootlet is Rootletin [47, 50]. Consisten ...
... bodies of both motile and immotile cilia, such as photoreceptor cells. In this cell type, the rootlet extends from the outer segment, a highly specialized modified cilium, to the synaptic terminal at the opposite end of the cell [48, 49]. One component of the rootlet is Rootletin [47, 50]. Consisten ...
Anatomy Review: Respiratory Structures
... • The relationship between the pleurae and the lungs can be demonstrated by pushing a fist into a waterfilled balloon. The balloon represents the pleurae, and the fist represents the lung. • As the fist pushes into the balloon, notice how the balloon wraps around it, and the opposite surfaces of the ...
... • The relationship between the pleurae and the lungs can be demonstrated by pushing a fist into a waterfilled balloon. The balloon represents the pleurae, and the fist represents the lung. • As the fist pushes into the balloon, notice how the balloon wraps around it, and the opposite surfaces of the ...
DOC - ADAM Interactive Anatomy
... • The relationship between the pleurae and the lungs can be demonstrated by pushing a fist into a waterfilled balloon. The balloon represents the pleurae, and the fist represents the lung. • As the fist pushes into the balloon, notice how the balloon wraps around it, and the opposite surfaces of the ...
... • The relationship between the pleurae and the lungs can be demonstrated by pushing a fist into a waterfilled balloon. The balloon represents the pleurae, and the fist represents the lung. • As the fist pushes into the balloon, notice how the balloon wraps around it, and the opposite surfaces of the ...
sponge fact sheet - World Animal Foundation
... Most sponges are hermaphroditic (both male and female), but play either the male or female role during reproduction. Sperm is released into the water by "male" sponges and travels to "female" sponges, where fertilization occurs internally. Baby sponges are released from the female sponge and float a ...
... Most sponges are hermaphroditic (both male and female), but play either the male or female role during reproduction. Sperm is released into the water by "male" sponges and travels to "female" sponges, where fertilization occurs internally. Baby sponges are released from the female sponge and float a ...
36 classification a
... IB holds you to no more details here. The AP only teachers have pushed more of these chapters. (We hit the last two text sections under human evolution.) ...
... IB holds you to no more details here. The AP only teachers have pushed more of these chapters. (We hit the last two text sections under human evolution.) ...
tissues
... • An animal’s size and shape directly affect how it exchanges energy and materials with its surroundings • Exchange occurs as substances dissolved in the aqueous medium diffuse and are transported across the cells’ plasma membranes • A single-celled protist living in water has a sufficient surface a ...
... • An animal’s size and shape directly affect how it exchanges energy and materials with its surroundings • Exchange occurs as substances dissolved in the aqueous medium diffuse and are transported across the cells’ plasma membranes • A single-celled protist living in water has a sufficient surface a ...
Tissues Part B PPT
... Photomicrograph: Smear of human blood (1860x); two white blood cells (neutrophil in upper left and lymphocyte in lower right) are seen surrounded by red blood cells. ...
... Photomicrograph: Smear of human blood (1860x); two white blood cells (neutrophil in upper left and lymphocyte in lower right) are seen surrounded by red blood cells. ...
BIOL 105 S 2013 Midterm Exam 1 Q 130311.5
... 41. A mature red blood cell lacks a nucleus. Thus, it A) can repair itself readily. B) is malformed. C) can only divide once more. ...
... 41. A mature red blood cell lacks a nucleus. Thus, it A) can repair itself readily. B) is malformed. C) can only divide once more. ...
Chapter 4b
... • Local blood vessels become more permeable, allowing white blood cells, fluid, clotting proteins and other plasma proteins to seep into the injured area. • Clotting occurs; surface dries and forms a scab. ...
... • Local blood vessels become more permeable, allowing white blood cells, fluid, clotting proteins and other plasma proteins to seep into the injured area. • Clotting occurs; surface dries and forms a scab. ...
File
... • Local blood vessels become more permeable, allowing white blood cells, fluid, clotting proteins and other plasma proteins to seep into the injured area. • Clotting occurs; surface dries and forms a scab. ...
... • Local blood vessels become more permeable, allowing white blood cells, fluid, clotting proteins and other plasma proteins to seep into the injured area. • Clotting occurs; surface dries and forms a scab. ...
biology final
... shows where the statements in the old specification are covered in the new spec, indicates where they are no longer assessed and highlights where new content has been added. ...
... shows where the statements in the old specification are covered in the new spec, indicates where they are no longer assessed and highlights where new content has been added. ...
Review Questions
... Contractions of the uterus during birth are accomplished by which of these cell types? a) cardiac; b) skeletal; c) smooth ANS is c ...
... Contractions of the uterus during birth are accomplished by which of these cell types? a) cardiac; b) skeletal; c) smooth ANS is c ...
Chapter C1
... • All cells have cell membranes. The cell membrane is a protective barrier that encloses a cell. • The cell membrane is the outermost structure in cells that lack a cell wall. In cells that have a cell wall, the cell membrane lies just inside the cell wall. • The cell membrane contains proteins, lip ...
... • All cells have cell membranes. The cell membrane is a protective barrier that encloses a cell. • The cell membrane is the outermost structure in cells that lack a cell wall. In cells that have a cell wall, the cell membrane lies just inside the cell wall. • The cell membrane contains proteins, lip ...
Skeletal System
... model, it is easy to see that the appendicular bones have more pipe cleaners, or joints, than the axial bones, which shows that the appendicular bones work to help us move. Also, you can also see that the axial bones have large “empty” spaces inside of them, suggesting that these bones mainly functi ...
... model, it is easy to see that the appendicular bones have more pipe cleaners, or joints, than the axial bones, which shows that the appendicular bones work to help us move. Also, you can also see that the axial bones have large “empty” spaces inside of them, suggesting that these bones mainly functi ...
Lymph nodes
... vessels drain interstitial fluid (cells and large macromolecules) from tissues to venous blood. They begin as "porous" blind-ended lymphatic capillaries in tissues of the body and converge to form a number of larger vessels, which ultimately connect with large veins in the root of the neck. ...
... vessels drain interstitial fluid (cells and large macromolecules) from tissues to venous blood. They begin as "porous" blind-ended lymphatic capillaries in tissues of the body and converge to form a number of larger vessels, which ultimately connect with large veins in the root of the neck. ...
Question paper - Paper 2H - June 2010
... Albinism is an inherited condition in which animals have white fur. Albinism is controlled by a single gene that has two alleles. The allele for albinism, a, is recessive. The dominant allele, A, produces brown fur. ...
... Albinism is an inherited condition in which animals have white fur. Albinism is controlled by a single gene that has two alleles. The allele for albinism, a, is recessive. The dominant allele, A, produces brown fur. ...
Fall Semester Exam Review Anatomy and Physiology Mr. Skinner
... Human somatic cells contain _____ pairs of chromosomes. A. 12 B. 21 C. 23 D. 46 E. 48 Which of the following can always be broken down into two or more different substances? A. atom B. molecule C. element D. compound E. none of the above This organelle stores the DNA in the cell. A. mitochondria B. ...
... Human somatic cells contain _____ pairs of chromosomes. A. 12 B. 21 C. 23 D. 46 E. 48 Which of the following can always be broken down into two or more different substances? A. atom B. molecule C. element D. compound E. none of the above This organelle stores the DNA in the cell. A. mitochondria B. ...
Cell theory
In biology, cell theory is a scientific theory which describes the properties of cells. These cells are the basic unit of structure in all organisms and also the basic unit of reproduction. With continual improvements made to microscopes over time, magnification technology advanced enough to discover cells in the 17th century. This discovery is largely attributed to Robert Hooke, and began the scientific study of cells, also known as cell biology. Over a century later, many debates about cells began amongst scientists. Most of these debates involved the nature of cellular regeneration, and the idea of cells as a fundamental unit of life. Cell theory was eventually formulated in 1838. This is usually credited to Matthias Schleiden and Theodor Schwann. However, many other scientists like Rudolf Virchow contributed to the theory. Cell theory has become the foundation of biology and is the most widely accepted explanation of the function of cells.The three tenets to the cell theory are as described below: All living organisms are composed of one or more cells. The cell is the most basic unit of life. All cells arise from pre-existing, living cells, by biogenesis.