How does antidiuretic hormone affect the permeability of the collecting ducts to water?
a) it increases their permeability
b) it does not affect their permeability
c) it decreases their permeability
a) it increases their permeability
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Protein malnourishment may occur if the diet is deficient in
A) essential amino acids. B) nonessential amino acids. C) urea. D) ammonia. E) keto acids.
Which of the following is not correct pertaining to a male patient scheduled for internal carotid endarterectomy?
A) He has atherosclerotic thickening of the intima of his internal carotid artery. B) He is at risk for a transient ischemic attack. C) A Doppler color flow study could have been used to detect his condition. D) One of the nerves typically at risk during this procedure is the recurrent laryngeal nerve. E) Nerve damage during the procedure can result in loss of sensory innervation of the larynx superior to the vocal folds.
What is the purpose of the energy extracted from ATP in this figure?
A)to generate a sodium concentration gradient B)to power a chemical reaction between sodium and glucose C)to transport glucose across the membrane D)to power a chemical reaction between sodium and potassium
Place the following events of excitation in the correct order
1. ion channels on the sarcolemma open and sodium ions enter the muscle fiber 2. the entry of sodium ions into the muscle fiber depolarizes the sarcolemma locally 3. acetylcholine is released from vesicles in the motor neuron into the synaptic cleft 4. an action potential arrives at the axon terminal of a motor neuron 5. acetylcholine binds to ligand-gated sodium ion channels in the motor end plate A) 2, 4, 3, 5, 1 B) 3, 4, 5, 1, 2 C) 4, 5, 3, 2, 1 D) 4, 3, 5, 1, 2