Which of the following delivers blood to the right atrium?
a. coronary sinus
b. inferior vena cava
c. superior vena cava
d. all of the above
Answer: d. all of the above
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Ions with a + charge are called
A) cations. B) anions. C) radicals. D) positrons. E) isotopes.
If the connection between the AV node and bundle of His becomes blocked,
A) the ventricles will beat more slowly. B) the ventricular rate of contraction will not be affected. C) tachycardia will occur. D) the stroke volume will increase. E) the ventricles will beat faster.
Parturition
A. is an example of negative feedback. B. normally occurs between the 27th and 28th weeks of pregnancy. C. occurs within 24 to 48 hours of ovulation. D. is a pathological condition in which a pregnant woman retains too much fluid (edema), and it can lead to seizures. E. is the delivery of the infant and placenta.
Which of the following cells undergoes meiosis to produce four sperm?
A) spermatids B) spermatogonium C) primary spermatocyte D) ovum E) zygote