Venous return to the heart is aided by ________ and the ________.
Fill in the blank(s) with the appropriate word(s).
the skeletal muscle pump, respiratory pump
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Scientists recently discovered a possible new route for direct exchange of materials between cells: ____
a. piggy back molecules b. tunneling nanotubes c. microcrystals d. protein carriers e. lipid bridges
Which of the following statements is true?
a. The spine evolved as an adaptation for swimming in fish. b. Some organisms have vestigial genes. c. Enantiostasis involves a change in two variables. d. Two of these. e. All of these.
Which vessel feeds oxygenated blood into the cerebral arterial circle (circle of Willis) of the brain?
A) external carotid artery B) internal carotid artery C) external iliac artery D) subclavian artery
Most absorption takes place in which part of the small intestine?
A. Ileum B. Duodenum C. Jejunum D. Absorption happens equally throughout the small intestine.