Chordae tendineae:a
hold the AV valves in place.
b. contract when the heart contracts.
c. are one part of the conductance system of the heart.
d. regulate blood flow into the ventricles.
e. are stretched during ventricular systole
a
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As electrons are passed through the system of electron carriers associated with photosystem II, they lose energy. What happens to this energy?
A) It excites electrons of the reaction center of photosystem I. B) It is lost as heat. C) It is used to establish and maintain a proton gradient. D) It is used to phosphorylate NAD+ to NADPH, the molecule that accepts electrons from photosystem I.
Ovules develop within the ovary, which is located in the swollen lower portion of which floral organ?
A. stamen B. stigma C. anther D. filament E. pistil
The basic rhythm of the heartbeat is set by the ________
A) systolic pressure B) EKG C) sinoatrial node D) "fight-or-flight" hormone
Which of the following human diseases can be caused by microsporidia? (Check all that apply.)
A. Contact dermatitis B. Nephritis C. Encephalitis D. Diarrhea E. Pneumonia