What fontanel is present at birth and is between the frontal and parietal bones where the frontal, coronal, and sagittal sutures intersect?
A) mastoid
B) posterior
C) sphenoidal
D) anterior
D
Explanation:
A) The mastoid fontanel is found where the squamous and lambdoid sutures meet.
B) The posterior fontanel is at the juncture of the occipital and parietal bones.
C) The sphenoidal fontanel is at the union of the coronal and squamous sutures.
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An increase in the partial pressure of oxygen causes pulmonary arterioles to ________, thereby altering _______ to make gas exchange more efficient
A. constrict; perfusion B. dilate; perfusion C. constrict; ventilation D. dilate; ventilation
The pressure in the left ventricle drops below the pressure in the left atrium during which phase of the cardiac cycle?
a. atrial systole b. isovolumetric contraction c. ventricular systole d. isovolumetric relaxation
Oxytocin
A. stimulates ejection of milk from the breasts. B. secretion is regulated by a negative feedback loop. C. is produced and secreted by cells in the supraoptic nucleus of the hypothalamus. D. is produced only in females. E. All of the choices are correct.
You have spent 24 hours traveling from the U.S to New Zealand, on quite a few airplanes with many stops. Because of the stress, changes in time zones, and short blocks of time between planes, you find yourself tired with a headache when you arrive. You are severely dehydrated. A hematocrit value of your blood would be ________ than normal because ________
A) lower; more red blood cells are being made by the bone marrow B) higher; you have less blood plasma volume C) lower; the bone marrow is making fewer red blood cells due to the latitude of the airplanes D) higher; more plasma proteins are made by the liver E) lower; you have less blood plasma volume