What stimulates a muscle cell to contract?
A. an impulse from a sensory neuron
B. an impulse from a motor neuron
C. auto-depolarizing cells in the membrane of
muscle cells
D. hormones
B
You might also like to view...
Which structures indicate where crossing over has occurred?
A. chiasmata B. centromeres C. kinetochores D. centrioles E. spindle fibers
Some ___ have enzymes to break the bonds of
atmospheric nitrogen and use it for the metabolism of proteins and other nitrogen containing molecules.
a. fungi b. bacteria c. plants d. protists e. fungi, bacteria, and protists
Which of the following is NOT an action of the sympathetic nervous system?
a. to dilate the bronchioles b. to stimulate saliva production c. to increase heart rate d. to increase blood pressure e. to inhibit penile erection
Which of the following is part of the brain?
A) thymus B) hypothalamus C) adrenal cortex D) thyroid