The portion of the urethra that passes through the pelvic cavity floor is called the
A) membranous urethra.
B) bulbo-urethral.
C) penile urethra.
D) ureter.
E) prostatic urethra.
E
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Julia is a new mother who plans to continue lactation for at least a year after her baby is born. At a post-parturition doctor's visit, the doctor says her blood test indicates declining levels of estrogen and progesterone. Will this interfere with her plans to lactate?
A. Yes, high levels of estrogen and progesterone are required for milk production. B. No, because the secretion of oxytocin and prolactin are more important for lactation. C. No, because even in the absence of hormones, suckling at the breast is sufficient stimulus for milk production. D. Yes, high levels of estrogen and progesterone are required for milk ejection.
An enzyme is a ____
A) fibrous protein that is part of certain tissues in the body B) protein that speeds up chemical reactions without being changed or depleted C) protein that functions as a hormone D) protein that inhibits chemical reactions by being changed or depleted
Describe the effect of exposure to UV rays on the skin.
A. Improved skin tone B. Increased melanin synthesis C. Decreased cancer risk D. Increased vitamin B production
ATPase is found in
A. troponin molecules. B. myosin heads. C. tropomyosin grooves. D. F-actin strands. E. G-actin globular units.