Answer the following statements true (T) or false (F)
1. A motor neuron and all the muscle cells it stimulates are called a motor unit.
2. The point of contact between the nerve and muscle is called a motor unit.
3. The minimum level of stimulation required to cause a muscle fiber to contract is called the threshold stimulus.
4. When a muscle fiber is exposed to a greater-than-threshold stimulus, it contracts completely. This is called an all-or-none response.
5. All motor units in a given muscle have the same threshold stimulus.
1. TRUE
2. FALSE
3. TRUE
4. TRUE
5. FALSE
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The ________ is not an endocrine gland but it has a role in endocrine function.
A. thyroid gland B. pancreas C. parathyroid gland D. kidney E. adrenal gland
Which of the following is mismatched?
A. Central nervous system - brain B. Autonomic nervous system - sympathetic and parasympathetic divisions C. Peripheral nervous system - sensory and motor divisions D. Peripheral nervous system - spinal nerves E. Somatic nervous system - sensory division of PNS
Which of the following is a function of the membrane proteins called channel proteins?
A) They bind to specific extracellular molecules to trigger a cellular change. B) They permit the passage of ions, bypassing the lipid portion of the cell membrane. C) They are enzymes. D) They serve as anchors or stabilizers for the cell membrane. E) They are used as a source of energy.
Which of the following may occur with aging?
A) more efficient tissue maintenance B) increased ability to repair connective tissues C) more fragile connective tissue D) increased bone strength E) thicker epithelia