How does an antagonist differ from a prime mover? How is it the same?
What will be an ideal response?
A prime mover is the muscle that causes the desired movement to occur. An antagonist is a muscle that opposes the action of the prime mover in a given movement. If, however, the direction of movement reverses, the former antagonist is now the prime mover and the former prime mover is now the antagonist.
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In which of the following situations does a resting membrane potential exist?
A. a relaxed muscle fiber B. a conducting neuron C. a stimulated sensory receptor in the skin D. a contracting cardiac muscle cell E. the eye seeing an image
DNA molecules are in the nucleus
A. complexed with protein, forming chromatin fibers. B. complexed with protein, forming nucleoli. C. complexed with protein on the nuclear envelope. D. as free molecules.
The region of the optic nerve lacking photoreceptor cells is known as the ________.
A) retina B) optic disc (blind spot) C) choroid D) iris
Kidneys are part of the lymphatic system.
Answer the following statement true (T) or false (F)