Which of the following structures allow the exchange of gases between the inhaled air and the blood?
A. The pulmonary alveoli and the bronchioles only
B. The pulmonary alveoli and the alveolar ducts only
C. The pulmonary alveoli, the bronchioles, and the alveolar ducts
D. The pulmonary alveoli only
Answer: D
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Gastrulation produces an oval, three-layered sheet known as the
A) chorion. B) blastula. C) embryonic disc. D) morula. E) blastocyst.
Put the following urinary structures in order as urine is produced and eliminated from the body 1 ) liver. 2 ) urinary bladder. 3 ) kidney. 4 ) ureter. 5 ) urethra
A) 1,3,2,4,5 B) 3,1,4,2,5 C) 3,5,2,4 D) 2,1,3,4,5 E) 3,4,2,5
Amplification during a second-messenger cascade is beneficial because amplification:
A. takes small molecules and makes polymers out of them. B. results in the production of more of the first messenger. C. allows a cell to respond to more different hormones. D. allows small amounts of hormones to produce large responses in target cells.
The clavicle articulates with the
A) manubrium. B) ribs. C) humerus. D) body of the sternum. E) cervical vertebrae.