How do arterioles control blood flow to specific tissues?
What will be an ideal response?
Answer: Vasoconstriction or dilation of arterioles can control blood flow to specific tissues. This can be controlled in many ways. For example, with exercising muscle, a fall in local oxygen level and pH, and a rise in local CO2 level due to metabolic activity of the muscle will cause vasodilation. The sympathetic nervous system can cause vasoconstriction of blood flow to the gut during exercise, and can cause dilation of blood flow to the skin if the body is overheating. Many hormones, such as epinephrine, angiotensin II, vasopressin affect vasoconstriction/dilation more generally, and these are important in blood pressure regulation.
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When blood starts to become more alkaline than normal, the renal tubules begin to
A. secrete bicarbonate and H+ through type B cells. B. secrete bicarbonate while reabsorbing H+ in exchange through type B cells. C. secrete H+ while reabsorbing bicarbonate in exchange through type A cells. D. absorb bicarbonate and H+ through type A cells.
Transcription yields protein and translation produces RNA
Indicate whether the statement is true or false
The proliferative phase of the menstrual (uterine) cycle
a. occurs when the ovarian cycle is in the follicular phase. b. lasts from menstruation to ovulation. c. occurs when the endometrium is repairing itself and thickening under the influence of estrogen. d. two of these answers. e. all of these answers.
The neuron plasma membrane is approximately _______ times more permeable to potassium ions that to sodium ions.
Fill in the blank(s) with the appropriate word(s).