Venules unite to form ________.
A. veins
B. capillaries
C. arterioles
D. venae cavae
Ans: A. veins
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Which layer of the skin is composed mainly of dense irregular connective tissue containing collagen and elastic fibers?
a) Hypodermis b) Basement membrane c) Epidermis d) Dermis e) Subcutaneous (subQ) layer
Estradiol is a type of estrogen whose hormone effects promote female sex characteristics. Its structure consists of various carbon-hydrogen rings and it is a lipid, but not a prostaglandin. Knowing the structure, how would you expect this hormone to cause a response in a target cell?
A. Estradiol will bind to a receptor on the surface of its target cell, causing a secondary messenger to be activated. B. Estradiol will enter the plasma membrane of a target cell directly and bind to an intercellular receptor, causing a change in gene expression. C. Estradiol will act as a second messenger in a receptor-mediated pathway after a primary messenger binds to a membrane receptor. D. Estradiol will act as a paracrine signal and inactivate adenylate cyclase inside the cell, stopping production of cAMP.
Explain what meaning is inferred in the muscle name rectus femoris
What will be an ideal response?
The natural age-related loss of bone mass is called
A) osteogenesis imperfecta. B) osteoporosis. C) osteomalacia. D) osteodysplasia. E) osteopenia.