What structure sends the electrical impulse to stimulate the ventricles to contract?
A. Atrioventricular bundle
B. Sinoatrial node
C. Purkinje fibers
D. Atrioventricular node
Answer: D
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Select the most correct statement.
A) The immune system is closely associated with the lymphatic system. B) Organ systems operate independently of each other to maintain life. C) The endocrine system is not a true structural organ system. D) Organ systems can be composed of cells or tissues, but not both.
Enantiostasis is
a. the maintenance of a nearly constant internal environment by direct compensatory mechanisms. b. the maintenance of one of two constant internal environments, in which the two environments are mirror images of each other. c. the maintenance of a nearly constant internal environment by an indirect compensatory mechanism. d. none of these.
The volume of blood ejected from each ventricle during a contraction is called the
A) end-diastolic volume. B) end-systolic volume. C) stroke volume. D) cardiac output. E) cardiac reserve.
Lymph nodes are centers for the production of ________, which act against foreign particles carried in lymph.
Fill in the blank(s) with the appropriate word(s).