An action potential rapidly spreads to the central portions of a muscle cell by means of
a. Z lines
b. sarcoplasmic reticulum
c. T tubules
d. lateral sacs
e. both a and c
C
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Which of the following parts of a nervous reflex arc is usually a muscle or gland?
a) Sensory receptor b) Sensory neuron c) Motor neuron d) Effector e) Integration center
A 100-lb sheep can pull very hard and potentially injure a hand or fingers if ______________________________________
Fill in the blank(s) with correct word
Endocrine glands
A) have ducts. B) secrete hormones. C) secrete substances onto a surface or into an organ. D) do both secrete hormones and secrete substances onto a surface or into an organ. E) have all of these characteristics.
In a(n) ________ reflex, a sensory neuron synapses directly on a motor neuron
A) sensory B) motor C) polysynaptic D) monosynaptic E) integrative