This figure shows the thoracic cage which number(s) indicate a costal notch?
A. 2, 3
B. 3
C. 2, 3, 6
D. 2, 6
E. 3, 6
E
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Parasympathetic stimulation and epinephrine enhance the heart's contractility
a. True b. False Indicate whether the statement is true or false
At rapid heart rates,
a. the lengths of systole and diastole shorten equally. b. the length of systole stays almost constant, but the length of diastole shortens considerably. c. the length of systole increases at the expense of diastolic time shortening. d. diastolic time lengthens, and systolic time shortens. e. none of these answers.
Which part of the brain helps to regulate the ANS actions from the medulla during motion sickness?
A. Cerebrum B. Cerebellum C. Limbic system D. Hypothalamus
Which of the following might serve as a secondary pacemaker for the heart?
A) Both AV node and Purkinje fibers B) AV node C) Purkinje fibers D) Neither AV node nor Purkinje fibers