What mechanisms are responsible for producing concentrated urine?
a. The juxtamedullary nephrons becoming active.
b. The countercurrent mechanism pulls out much water.
c. Vasopressin promotes more water reabsorption in distal tubule.
d. Both b and c
e. None of the above.
D
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Which organ system functions in defense against infection and disease?
A) digestive B) endocrine C) nervous D) cardiovascular E) lymphatic
The electron transport system refers to oxidative phophorylation using the coenzymes FADH2 and _______
Fill in the blank with correct word.
Which statement is not true?
A. During ventricular systole, the pulmonary semilunar valve is open. B. During ventricular systole, the atria are filling with blood. C. During ventricular systole, the bicuspid valve is open. D. During ventricular systole, the aortic semilunar valve is open. E. During ventricular systole, the tricuspid valve is closed.
An athlete who is nearing the end of a 2-kilometer run would be expected to have both an increased mean arterial blood pressure and an increased total peripheral resistance
Indicate whether the statement is true or false.