Which hormones are formed from chains of amino acids?
A. Proteins and biogenic amines
B. Biogenic amines
C. Steroids and biogenic amines
D. Steroids
E. Proteins
Answer: E
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A single motor neuron together with all the muscle fibers it innervates is called a(n)
A) end foot. B) end plate. C) motor unit. D) dermatome. E) myotome.
Answer the following statements true (T) or false (F)
1. In humans, melatonin may inhibit sexual maturation. 2. The antagonistic hormones that regulate the blood calcium level are calcitonin-parathormone. 3. The hormone that raises blood sugar levels is insulin. 4. Addison’s disease is due to a deficit output of glucocorticoids only. 5. Both "turn on" factors (hormonal, humoral, and neural stimuli) and "turn off" factors (feedback inhibition and others) may be modulated by the activity of the nervous system.
Phenylephrine functions as a/an ________ because it promotes ________ in nasal mucosa.
A. a1 antagonist; vasoconstriction B. b1 antagonist; vasodilation C. b1 agonist; vasodilation D. a1 agonist; vasoconstriction
Synovial joints are different from both fibrous and cartilaginous joints because synovial joints
A. use fibrous connective tissue to hold the bones in the joint together. B. are enclosed by a joint capsule. C. are only temporary; they are replaced in the adult. D. generally have both bones in the joint fused together. E. are not freely moveable.