What is the advantage of a closed circulatory system over an open one?
A) A closed system carries more blood.
B) In a closed system, the blood comes nearer to each cell.
C) Blood flows more slowly in a closed system.
D) There are more blood cells in a closed system.
E) A closed system moves blood more efficiently.
E
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Maximum force is generated by a muscle contraction when:
A. the myofibril is stretched. B. there is excessive overlap between actin and myosin. C. the sarcomere is at intermediate length prior to initiation of contraction. D. intracellular calcium levels are low.
Which of the following occurs to transmit signals from one neuron to another?
a. Electrical signals cross the synapse. b. An action potential jumps the synapse. c. ATP starts an action potential in the postsynaptic cell. d. The presynaptic cell releases a neurotransmitter
What is the nutrient cycle in nitrification?
a. Nitrogen, nitrate, nitrite b. Ammonia, nitrite, nitrate c. Ammonia, nitrate, nitrite d. Ammonia, nitrogen, nitrite
Name the three proteins that are important in maintaining the resting potential of a neuron
What will be an ideal response?