Receptor molecules in synapses
A. serve as channel proteins.
B. have a high degree of specificity.
C. tend to concentrate on presynaptic terminals.
D. can bind to any molecule in the synapse.
E. bind irreversibly with neurotransmitter.
Answer: B
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Which of the following affects the force-generating capability of a muscle?
A. the muscle length and cross-sectional area B. the angle and distance from the joint center of the tendon attachment to bone C. the velocity of muscle shortening D. all of the above
Which of the following is not a role of ionic calcium in muscle contraction?
A) triggers neurotransmitter secretion B) promotes breakdown of glycogen and ATP synthesis C) removes contraction inhibitor D) activates epinephrine released from adrenal gland
What are the bone cells called that produce the organic matrix?
a. exocytes b. chondrocytes c. osteoblasts d. endocytes e. osteoclasts
The intracellular digestive organelle of a cell is the
A. lipochrome. B. smooth endoplasmic reticulum. C. lysosome. D. rough endoplasmic reticulum. E. microtubule.