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13 Cards in this Set

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True/False: Alpha cells of the pancreas secrete insulin when blood glucose levels are high
false
A person has a tumor in the anterior pituitary causing a decrease in ACTH secretion. Which of the following correctly describes changes in the plasma levels of hormones?
increased CRH, decreased ACTH, and decreased cortisol
The receptors for water-soluble hormones are located primarily _____.
on the surface of the target cell
What events could be a result of damage to they hypophyseal portal system?
decreased secretion of TSH
Cyclic-AMP functions as a second messenger to:
activate protein kinase A
The striations in skeletal muscle correspond with actual molecule structures. Which of the following is the I band?
a. A band where only actin molecules are found
b. A band where only myosin molecules are found
c. An attachment point for actin molecules
d. A band with thick filaments but no thin filaments
e. An attachment point for myosin molecules
a. A band where only actin molecules are found
FSH in males stimulates:
production of sperm
Increases in the amount of cytoplasmic calcium required to initiate a muscle contraction are mediated by the coupling between a ____ on the T tubule and a _____ on the membrane of the sarcoplasmic reticulum.
DHP receptor : calcium pump
True/False: Sarcomeres shorten when thin filaments contract, causing the entire muscle to contract.
false
True/False: Each motor neuron supplies just one muscle fiber.
false
What would be the consequence of defective ADH receptors?
dehydration
True/False: Hyposecretion of TSH would result in an increase in body temperature, heart rate and respiratory rate.
false
Describe the physiological effects that calcitonin and PTH have on blood calcium levels (include the name of the organ that secretes each hormone). Is this a type of hormonal, humoral or neural stimuli?
humoral stimuli
Calcitonin
Organ secreted from: parafollicular cells thyroid gland
Affect on blood calcium levels: increased blood calcium triggers calcitonin to secrete causing a decrease of blood calcium levels
PTH
Organ secreted from: parathyroid gland
Affect on blood calcium levels:
decreased blood calcium levels stimulates release of PTH to increase blood calcium levels