Which of the following have capillaries which are part of a portal system?
a. liver
b. pituitary
c. hypothalamus
d. liver, pituitary, and hypothalamus
e. pituitary and hypothalamus
D
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Which of the nitrogenous bases is part of DNA but not RNA?
A) Thymine B) Uracil C) Guanine D) Cytosine
Patients suffering from chronic obstructive pulmonary disease generally have more trouble exhaling than inhaling
Indicate whether the statement is true or false
Nurse cells are not
A) found in the seminiferous tubules. B) important in forming the blood-testis barrier. C) involved in coordinating spermatogenesis. D) precursors to gametes. E) also called Sertoli cells.
What is internal respiration?
A. the binding of oxygen to hemoglobin B. exchange of oxygen and carbon dioxide at the tissue level C. exchange of oxygen between the atmosphere and lungs D. mitochondrial use of oxygen to produce energy