Which hormone is primarily produced by the corpus luteum?
A) follicle-stimulating hormone (FSH)
B) progesterone
C) testosterone
D) androgens
E) luteinizing hormone (LH)
B
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Without macrophages, wound healing is delayed. Why?
What will be an ideal response?
Which of the following statements concerning the embryonic cardiovascular system is true?
A. The heart develops from four endothelial tubes. B. The bulbus cordis becomes the sinoatrial node (the adult pacemaker). C. Blood vessels form from blood islands. D. An opening in the interatrial septum is called the sinus venosus. E. There is an opening in the interventricular septum.
Which of the following is NOT true of farsightedness?
A. A convex lens is used to correct farsightedness. B. It is caused by the eyeball being too long. C. When a person is farsighted, distant objects are clear, but close objects look blurry. D. It is also called hyperopia. E. All of these are true of farsightedness.
Why are adipose tissue, blood, and bone all considered to be connective tissues?
A. They have the same types of cells. B. They have a common origin: mesenchyme. C. They connect to each other. D. They all have collagen and elastic fibers in their extracellular matrix.