What is accomplished by the power stroke?
A) The power stroke cocks the myosin head into its high-energy position.
B) The power stroke causes the myosin and actin filaments to shorten and contract.
C) The power stroke results in myosin heads pulling actin toward the center of the sarcomere.
D) The power stroke allows the myosin heads to bind to actin.
Answer: C
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Which of the following is the best explanation of the benefit in the digestive system having the largest collection of lymphoid tissue (MALT) at the distal end of the small intestine?
A) The alkaline secretion of the small intestine aid in the growth of bacteria and must be controlled. B) The body will actively excrete pathogens out the body, into the digestive system to be removed from the body in feces. C) The huge numbers of bacteria living in the large intestine must be prevented from entering the lumen of the small intestine and being absorbed with food's nutrients into the blood stream. D) The digestive systems first and foremost job is to digest and absorb nutrients so it puts off immunity for last.
The sympathetic division of the ANS would influence which of the following?
A. Cognitive processes used to formulate the answers on the exam B. Movement of your pencil during the exam C. Promotion of digestion of the sandwich you ate before the exam D. Adjustment of the ocular lens so that you can focus on the words of this exam E. Your heart rate during this exam
The two vertebral arteries fuse to form a large artery, the
A) circle of Willis. B) common carotid artery. C) external carotid artery. D) internal carotid artery. E) basilar artery.
Most of the body's water input comes from
A. in what we drink. B. in what we eat. C. in the air we inhale. D. from body metabolism.