Generation of an action potential at an axon of a neuron may be caused by
A) a change in the number of Schwann cells surrounding the axon.
B) stimulation of any portion of the dendrites of the neuron.
C) input from various presynaptic cells.
D) stimulation of any portion of the dendrites of the neuron and/or input from various presynaptic cells.
E) All of the answers are correct.
D) stimulation of any portion of the dendrites of the neuron and/or input from various presynaptic cells.
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Materials tend to move less rapidly when their concentrations are significantly different between two compartments
Indicate whether this statement is true or false.
Phosphate helps to form the backbone of what molecules?
a. organic acids b. polypeptides c. digestive enzymes d. DNA e. glucose
Which of the following factors would NOT tend to increase systemic arterial blood pressure?
A. Increased venous return B. Increased blood volume C. Increased parasympathetic stimulation D. Increased sympathetic stimulation E. Increased activity of the skeletal muscle pump
Explain two key concepts of the sarcomere length-tension relationship
A) (1 ) The greater the zone of overlap, the greater the tension the muscle can develop; and (2 ) there is an optimum range of actin and myosin overlap that will produce the greatest amount of tension. B) (1 ) The smaller the zone of overlap, the greater the tension the muscle can develop; and (2 ) there is an optimum range of actin and myosin overlap that will produce the greatest amount of tension. C) (1 ) The greater the zone of overlap, the less tension the muscle can develop; and (2 ) there is an optimum range of actin and myosin overlap that will produce the greatest amount of tension. D) (1 ) The greater the zone of overlap, the greater the tension the muscle can develop; and (2 ) there is an optimum calcium concentration that will produce the greatest amount of tension. E) (1 ) The smaller the zone of overlap, the greater the tension the muscle can develop; and (2 ) there is an optimum calcium concentration that will produce the greatest amount of tension.