Why is hemoglobin enclosed in erythrocytes rather than existing free in plasma?
What will be an ideal response?
Enclosed within erythrocytes, hemoglobin is prevented from breaking into fragments that would leak out of the vascular system through porous capillaries. Additionally, because it's enclosed, hemoglobin cannot contribute to blood viscosity and osmotic pressure.
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Answer the following statements true (T) or false (F)
1. Epinephrine is secreted in greater amounts than norepinephrine in the adrenal medulla. 2. The hormone somatostatin is secreted by beta cells. 3. The hormone glucagon is secreted by G-cells. 4. Insulin is secreted by beta cells.
During the isovolumetric contraction period of the cardiac cycle,
A. AV and semilunar valves are closed. B. the atria are contracted. C. ventricular volume increases. D. blood is pumped into the large arteries. E. pressure in the ventricles decreases.
Spermatogenesis ________.
A) is the process of releasing mature sperm cells into the lumen of the seminiferous tubule B) involves a kind of cell division limited to the gametes C) results in the formation of diploid cells D) uses mitosis to produce gamete cells
An increase in urine volume is termed
A) diuresis. B) anuresis. C) urinary edema. D) dialysis.