Some ganglion cells of the retina contain ________ that is sensitive to luminance and helps the hypothalamus regulate circadian rhythms.
A. melatonin
B. melanopsin
C. photopsin
D. retinal
Answer: B
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When left atrial pressure exceeds left ventricular pressure,
A. left ventricular ejection begins. B. aortic blood pressure begins to rise. C. the bicuspid (mitral) valve opens. D. ventricular volume decreases. E. the tricuspid valve opens.
Fatty acids consist mainly of carbon and hydrogen, and so fatty acids are
A. nonpolar and do not dissolve in water.?B. nonpolar and dissolve in water.?C. polar and do not dissolve in water.?D. polar and dissolve in water.
Arteries carry blood toward the heart, while veins carry blood away from the heart.
Answer the following statement true (T) or false (F)
Which inspiratory muscles contract so we can inspire air?
A) rectus abdominis; external obliques B) diaphragm; external intercostals C) trapezius; latissimus dorsi D) diaphragm; external obliques