An embryonic septum that develops within the bulbus cordis and truncus arteriosus produces what structures?
A. The right and left atria
B. The right atrium and right ventricle
C. The ascending aorta and pulmonary trunk
D. The right and left ventricles
E. The left atrium and left ventricle
C. The ascending aorta and pulmonary trunk
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If the synovial membrane could not secrete synovial fluid,
A. the onset of arthritis would be slowed because synovial fluid generates friction within the joint capsule. B. the cartilage contained within the capsule would not receive nutrients from synovial membrane blood vessels. C. blood would not directly flow into the joint capsule to nourish cartilage. D. new cartilage would not be generated because synovial fluid is a stimulant for cartilage production.
The part of the homeostatic control mechanism that brings about change is the
A. control center.?B. stimulus.?C. effector.?D. receptor.
Which of the following would not be restricted (limited) by low levels of ATP?
A) exocytosis B) pinocytosis C) phagocytosis D) osmosis
Describe the simplest type of unicellular exocrine gland
A) Simple alveolar (acinar) gland; this is found during embryonic development and not in adults. B) Simple tubular gland; this gland has a single duct that does not divide at the straight glandular cells. C) Simple coiled tubular gland; this has a single duct but a coiled secretory area. D) Goblet cell; this cell is scattered among absorptive cells in the intestines. E) Simple holocrine cell; this cell will burst to release its secretions.