Cell membranes contain about one-half ________________________________________ and one-half ________________________________________
Fill in the blank(s) with correct word
protein, fat
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What abnormal heart rhythm could be caused by an elevated body temperature, excessive sympathetic stimulation, or toxic conditions?
A. bradycardia B. atrial fibrillation C. second-degree AV node block D. tachycardia
Cytokinesis begins with the formation of an indentation around the cell called the
A. cleavage furrow. B. centromere. C. equator. D. asters.
Left ventricular contraction propels blood through which valve?
a. left atrioventricular (bicuspid) valve b. Pulmonary valve c. Aortic valve d. Right atrioventricular (mitral) valve
A pedestrian narrowly avoids being hit by an oncoming car. He notices that it takes a little while for his heart rate and respiratory rate to return to normal. This is likely because
A) the parasympathetic nervous system has become activated. B) sympathetic activation of the adrenal medulla has released epinephrine and norepinephrine into the bloodstream. C) the splanchnic nerves have become activated. D) somatic motor neurons have increased the heart and respiratory rate. E) the corticospinal pathway has become activated.