Answer the following statements true (T) or false (F)
1) Irritation of the phrenic nerve may cause diaphragm spasms called hiccups.
2) The obturator nerve branches from the sacral plexus.
3) Reciprocal inhibition means that while one sensory nerve is stimulated, another sensory neuron for synergistic muscles in the same area is inhibited and cannot respond.
4) The mucous membrane that lines the eyelids and is reflected over the anterior surface of the eyeball is the conjunctiva.
5) Researchers have found that retinal ganglionic fields are of two types: on center or off center.
1) TRUE
2) FALSE
3) FALSE
4) TRUE
5) TRUE
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Movement of nutrients, wastes, and organelles between the cell body and axon terminals is called
A) osmosis. B) diffusion. C) axonal transport. D) axoplasmic transport. E) neurofibular contraction.
What would occur if ACh was not removed from the nicotinic receptors on skeletal muscle cells?
a. The cell would relax. b. The cell would repolarize with the opening of chloride channels. c. The cell would remain contracted until fatigued. d. Sodium would continue to move into the cell, causing excitation. e. Both c and d would occur.
The tricuspid valve is located between the ________
A) right atrium and left atrium B) right atrium and right ventricle C) left ventricle and pulmonary artery D) left ventricle and aorta E) right ventricle and the pulmonary trunk
Identify which statement best describes variation in human structure.
a. The common structures learned in anatomy texts are valid for about 50% or less of the human population b. The common structures learned in anatomy texts are valid for about 70% or less of the human population c. All humans have identical internal structures d. Only genetic mutants have variations in their internal structure