After a long scuba diving session on a Caribbean reef, Carl boards a plane to Dallas. He begins to feel pain in his elbow on the flight back to Dallas. What is happening to him?
What will be an ideal response?
Carl is experiencing the bends due to several problems: (1) Applying Boyle's law, a lot of gas was forced into Carl's bloodstream during the dive and there was not sufficient time to decompress the excess before he boarded the plane. (2) The plane is not pressurized to sea level, which further reduced atmospheric pressure holding the gases in suspension (Henry's law). Carl will have to be transported to a hyperbaric chamber to be repressurized. This will reduce the volume of the gas bubbles in his arm so that normal circulation can resume.
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Hundreds of years ago, explorers often died of scurvy. How can this bone-related disease be prevented?
A) Supplement the diet with more calcium from meat. B) Increase levels of testosterone to stimulate bone repair. C) Supplement the diet with fresh fruit rich in vitamin C. D) Drink more water to promote bone remodeling and repair. E) Amputate fractured limbs to prevent the spread of scurvy.
List 3 examples of a stock horse
What will be an ideal response?
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. This process of childbirth is an example of
A. positive feedback. B. acclimatization. C. feedforward regulation. D. negative feedback. E. adaptation.
Which of the following is not true of the sense of static equilibrium?
A. It helps a person maintain balance during angular acceleration. B. The sense organs are found within the vestibule. C. It is also called gravitational equilibrium. D. It helps to keep the head in balance when a person is not moving. E. All of these are true of the sense of static equilibrium.