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 prevent calcium from entering cardiac muscle, thus slowing down the heart rate.
C. They prevent calcium from entering smooth muscle, thus allowing the muscle to relax.
D. They prevent calcium from exiting the sarcoplasmic reticulum in skeletal muscle.
E. They stimulate the calcium pump in smooth muscle, thus removing calcium from the calmodulin.
Answer: C
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The town of Nederland, Colorado, has a winter festival called Frozen Dead Guy Days. A man named Bredo Morstoel, a native Norwegian, was born in 1900 and died in 1989. After his death, his grandson had his body cryogenically frozen and stored it in a shed in Colorado until a future date when he supposedly will be resuscitated. Why will this thawing procedure NOT bring Mr. Morstoel back to life?
a. freezing temperatures cause water to expand, which would burst cell membranes b. death had already occurred before the freezing process c. the ratio of surface area to volume is low in Mr. Morstoel's body, meaning that ice crystals would have formed during the freezing process d. all of the above
Which of the following lymphoid tissues/organs does NOT contain reticular connective tissue?
A. tonsils B. thymus C. spleen D. lymph nodes
Which of the following is not involved in chemical digestion?
A. mouth B. small intestine C. large intestine D. stomach
When a person hyperventilates, there are lower than normal levels of PCO2 and hydrogen ion in arterial blood, a condition called respiratory alkalosis.
Answer the following statement true (T) or false (F)