What is hydrostatic pressure?
A) Pressure exerted by a fluid at rest
B) Pressure exerted by a fluid in motion
C) Resistive forces generated by fluid viscosity
D) High blood pressure
Answer: A
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In what species is anesthesia regularly used when performing a castration?
What will be an ideal response?
When a giraffe holds its neck in a vertical position, its brain is about 2 meters above its heart. Contraction of the ventricle must create enough pressure to raise the blood to the level of the head and perfuse the brain (i.e
, circulate blood through the brain). The arterial pressure at the aorta of a giraffe is approximately 200 mm Hg, twice that of a human. The brain of a sauropod dinosaur, such as Barosaurus, would have been about 9 meters above the level of its heart if it held its neck vertically. Calculate the aortic pressure required to perfuse the brain using the following information: • The density of blood is 1.055 g/cm3 and the density of mercury 13.554 g/cm3 • An aortic pressure of 10 mm Hg is needed to overcome resistance to blood flow in the carotid arteries leading from the heart to the brain. • A blood pressure of 50 mm Hg at the head is required to perfuse the brain. What inferences about the biology of sauropods can you draw from your calculation?
Hypersecretion of this hormone results in loss of calcium from the bones, and softening and spontaneous fractures of the bones
A) parathyroid hormone B) growth hormone C) gonadocorticoids D) insulin
The effects of cell-mediated immunity are the result of activities of
A. B cells. B. cytotoxic T cells. C. macrophages. D. dendritic cells. E. helper T cells.