Which valve prevents the backflow of blood into the left ventricle when the ventricles relax?
A. Left atrioventricular valve
B. Aortic semilunar valve
C. Right atrioventricular valve
D. Pulmonary semilunar valve
E. None of the choices is correct.
B
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Neutrophils
A) Are the least abundant of the leukocytes in mammals. B) Stain dark blue by the histological H&E stain. C) Use both phagocytosis and secretion of antimicrobial agents to destroy microbes. D) B and C
An animal that is able to sustain life by only eating plants is a/an ________
Fill in the blank(s) with correct word
The homeostasis of the body is controlled through a series of steps called a feedback system or feedback loop. One component of such systems is a control center. Which of the following organs would frequently serve as the control center for a feedback system (remember, the control center evaluates the disruption to homeostasis, and it also triggers a response)?
a. skeletal muscles b. brain c. nerve endings in the skin d. blood and lymphatic fluid e. sweat glands