Select the most correct statement
A) Organ systems can be composed of cells or tissues, but not both.
B) The immune system is closely associated with the lymphatic system.
C) Organ systems operate independently of each other to maintain life.
D) The endocrine system is not a true structural organ system.
Answer: B
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Segmentation of the small intestine
A. are peristaltic movements that sweep undigestible materials out of the small intestine between meals. B. occurs at a rate of 3 contractions per minute throughout the small intestine, although the strength of contractions is much greater in the ileum, which has a much thicker layer of smooth muscle in its walls. C. mixes chyme with digestive enzymes, brings food molecules near the wall for absorption, and slowly moves small intestine contents toward the cecum. D. occurs only between meals, and functions to stimulate the secretion of gastrin and the resulting mass movements that empty the large intestine. E. functions mainly to prevent any forward movement of chyme, so that all digestion and absorption is complete before undigestible materials move into the jejunum.
Homeostatic regulation usually involves a(n) ________ that detects a particular stimulus, and a(n) ________ that responds to the stimulus by communicating with a(n) ________ whose activity has an effect on the same stimulus
A) control center; effector; receptor B) receiver; communicator; effector C) receptor; control center; effector D) effector; receiver; communicator E) control center; receiver; effector
If a person is breathing 15 times a minute and has a tidal volume of 500 mL, the total respiratory minute volume is __________.
a. 7500 mL/min b. 5150 mL/min c. 515 mL/min d. 7500 min/mL
What ion is necessary for the release of neurotransmitter from synaptic vesicles?
A. chloride B. sodium C. potassium D. calcium