. This figure shows an example of regulation of hormone secretion by a negative feedback loop. The large box labeled 1 represents the initial stimulus. Which could be the initial stimulus for this pattern of regulation?
A. High blood calcium level
B. Low body temperature
C. Low blood sugar level
D. High WBC (white blood cell) count
E. Low RBC (red blood cell) count
B
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At what developmental stage do red blood cells leave the bone marrow and enter the circulating blood?
A. Erythroblast B. Precursor cell C. Reticulocyte D. Erythrocyte E. Myeloblast
Answer the following statements true (T) or false (F)
1. Your BMR is usually above your TMR. 2. To maintain your weight, your caloric intake should equal your BMR. 3. To lose weight, reduce your caloric intake to below your TMR. 4. The skin is involved in a positive feedback loop for thermoregulation. 5. The body can regulate its heat by controlling the amount of blood near the surface of the skin.
The formation of lymph increases as a result of
A) increasing hydrostatic pressure in tissue fluid. B) decreasing protein concentration in tissue fluid. C) decreasing volume of tissue fluid. D) increasing osmotic pressure in blood capillaries.
Which is the primary absorptive organ of the digestive system?
a. salivary glands b. oral cavity c. stomach d. small intestine e. colon