Which of the following best describes the cerebral arterial circle (circle of Willis)?
A. An anastomosis surrounding the pituitary gland
B. A portal system connecting the hypothalamus with the anterior pituitary
C. A short anastomosis found in the cerebellum
D. Formed by the superior and inferior sagittal sinuses
E. An anastomosis circling the entire cortex
A. An anastomosis surrounding the pituitary gland
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Atrial natriuretic peptide is a hormone that is made in the atria of the heart. The influence of this hormone is to ________.
A) enhance atrial contractions B) activate the renin-angiotensin mechanism C) prevent pH changes caused by organic acid D) reduce blood pressure and blood volume by inhibiting sodium and water retention
The overall functioning of the ANS contributes to
a. conservation of energy resources when stress levels are low b. mobilization of energy reserves when stress levels are high c. suppression of non-vital activities when stress levels are high d. homeostasis e. all of the above
Of the following muscles of the thigh which one has its origin on the ilium, sacrum and coccyx and its insertion on the posterior surface of the femur?
A) gluteus maximus B) adductor magnus C) biceps femoris D) gluteus minimus
The tricuspid valve is closed
A. during active filling of the ventricles. B. when the mitral valve is open. C. while the atria are contracting. D. during ejection. E. during passive filling of the ventricles.