At threshold, an axon will _______.
A) generate an action potential during the relative refractory period
B) always generate an action potential
C) generate an action potential after the absolute and relative refractory periods have elapsed
D) generate an action potential during the absolute refractory period
Ans: C) generate an action potential after the absolute and relative refractory periods have elapsed
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Which of the following is not an action of TSH?
A) stimulates T3 and T4 secretion B) stimulates iodide trapping by thyroid follicle cells C) inhibits T3 and T4 secretion D) stimulates pinocytosis of colloid by thyroid follicle cells E) increases cyclic AMP concentration within thyroid follicle cells
What is the difference between cell movements in response to outside forces and cell-generated movements (in response to specific cell activity)? (Hint: Do red blood cells move because of RBC activity? What causes cell movements associated with cytokinesis?) Using the index of your text to guide you to relevant sections in other chapters (look up entries for the various cytoskeletal proteins),
explain the different types of movements that cells generate. What will be an ideal response?
An insufficient AV valve
a. fails to open completely b. is not connected to chordae tendineae c. produces a gurgling diastolic murmur d. allows blood to backflow into a ventricle during diastole e. allows blood to leak into the pulmonary artery during right ventricular diastole
The olfactory nerves may be damaged if the ________ bone is fractured.
A. ethmoid B. frontal C. temporal D. sphenoid E. occipital