The lens
A. is biconcave.
B. focuses light on the retina.
C. is normally opaque.
D. is attached to the retina by suspensory ligaments.
E. floats in the vitreous humor.
Answer: B
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Bill contracts a viral disease that destroys cells in the posterior gray horns in his spinal cord. As a result, which of the following would you expect?
A) loss of sensation in his torso B) inability to breathe C) problems with moving his arms D) uncontrollable sweating of his feet E) problems moving his legs
Match the following:
A) Aortic valve B) Mitral valve C) Pulmonary valves D) Tricuspid valve 1) Prevents backflow into the left ventricle. 2) Prevents backflow into the right atrium. 3) Prevents backflow into the left atrium. 4) Prevents backflow into the right ventricle. 5) AV valve with two flaps. 6) AV valve with three flaps.
Alopecia means:
A) hair growth B) crusty skin and pyoderma C) hair loss resulting in baldness D) reddened skin E) benign growth
Which of these is a hormone that lowers blood volume and blood pressure?
A) angiotensin-II (A-II) B) renin C) atrial natriuretic peptide (ANP) D) aldosterone