Upon a newborn's first breath, pulmonary arterioles
A. dilate.
B. constrict.
Answer: A
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Drugs called calcium channel blockers may be used to lower blood pressure by causing arteries to vasodilate. How do you suppose these drugs work?
A. They prevent calcium from entering the sarcoplasmic reticulum of smooth muscle. B. They stimulate the calcium pump in smooth muscle, thus removing calcium from the calmodulin. C. They prevent calcium from exiting the sarcoplasmic reticulum in skeletal muscle. D. They prevent calcium from entering cardiac muscle, thus slowing down the heart rate. E. They prevent calcium from entering smooth muscle, thus allowing the muscle to relax.
The rectum of reptiles or amphibians may be called a vent or ______________
Fill in the blank(s) with correct word
Hypersecretion of which of the following hormones is most likely to lead to high blood pressure and hypernatremia (excess blood sodium ion concentration)?
What will be an ideal response?
Which of the following choices lists the order of stages of cellular respiration in proper order?
A. Glycolysis, intermediate stage, electron transport system, and the citric acid cycle B. Glycolysis, intermediate stage, citric acid cycle, and the electron transport system C. Citric acid cycle, glycolysis, intermediate stage, and the electron transport system D. Glycolysis, citric acid cycle, intermediate stage, and the electron transport system E. Citric acid cycle, electron transport chain, intermediate stage, and glycolysis