Which of the following is TRUE of cardiac tissue?
A) It is multinucleated.
B) It has no striations.
C) The fibers are not branched.
D) It has cells joined by intercalated disks.
Ans: D) It has cells joined by intercalated disks.
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Gas X makes up 15% of a gas mix, at 760 mm Hg, the partial pressure of gas X would be ________.
A. 1140 mm Hg B. 646 mm Hg C. 114 mm Hg D. 11400 mm Hg
In the first phase of triggering an action potential in a neuron, Na+ ions flow in and
A) trigger a positive feedback loop and activate the sodium/potassium pump. B) only trigger a negative feedback loop. C) only trigger a positive feedback loop. D) trigger a negative feedback loop and activate the sodium/potassium pump. E) only activate the sodium/potassium pump.
The slow block refers to the mechanism that prevents fertilization of another egg when one is already pregnant
Indicate whether the statement is true or false
According to the hierarchy of motor control,
A. structures in the middle level receive information from both the higher and the local levels of the hierarchy. B. the local level of control includes the cerebellum and basal nuclei. C. afferent information from skin, joint, and muscle receptors cannot modify a movement once it has been initiated by a motor program from the middle level of the hierarchy. D. the highest level of control consists entirely of neurons in the primary motor region of the cerebral cortex. E. the middle level of control does not involve any areas of the cerebral cortex.