Which of the following would decrease the net flux of a penetrating solute into a cell?
A. increasing the permeability constant for that solute
B. decreasing the temperature
C. increasing the concentration of the solute in the extracellular fluid
D. increasing the area of the cell membrane
E. decreasing the thickness of the membrane
B
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During childbirth, as a baby's head is pressed against the mother's cervix, signals are relayed via nerves from cervix to the mother's brain. The brain initiates the secretion of oxytocin (a hormone) from the mother's pituitary gland. Oxytocin stimulates further uterine contractions. As the uterus contracts even harder in response to oxytocin, the baby's head is pushed harder against the cervix; this stimulates yet more nerve signals to the mother's brain, resulting in yet more oxytocin secretion until finally the baby is pushed through the cervix. The integrating center in this process of childbirth is
A. the mother's pituitary gland. B. oxytocin. C. the mother's brain. D. the mother's cervix. E. the nerve signals to the mother's brain.
An increased heart rate can result due to a decrease in parasympathetic stimulation or an increase in sympathetic stimulation of the heart
Indicate whether the statement is true or false
All reflex arcs contain an interneuron.
Answer the following statement true (T) or false (F)
During the excitement phase of intercourse, what makes the human penis enlarge and become rigid?
A) blood B) semen C) bone D) contracted muscles