____ is part of the chondrocranium that forms the opening through which the spinal cord leaves the skull
Fill in the blank(s) with the appropriate word(s).
Answer: Occipital bone
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The human body's arterial blood pH is tightly maintained around 7.4 by buffering agents that bind hydrogen ions to stop any change in pH. If an acid-base imbalance overcomes the buffer system, the body changes the ventilation rate, or the rate at which gas enters or leaves the lungs. Changing the ventilation rate changes the concentration of CO2 in the blood, which alters the pH of the blood. In this case, pH 7.4 is the:
A. homeostatic challenge. B. sensor. C. effector. D. integrator. E. set point.
Which hormones slow down stomach emptying?
a. gastrin and somatostatin b. somatostatin and secretin c. leptin and gastrin d. ghrelin and cholecystokinin e. secretin and cholecystokinin
What reward do many organisms receive for pollinating flowers?
A) protection from predators B) no reward C) nectar D) fruit
Stable isotope analysis to indicate whether or not certain elements have been processed by an organism is based on the observation that ________.
A. microbes generally prefer using the heavier of two stable isotopes B. microbes have no preference with regard to heavy versus light isotopes C. microbes generally prefer using the lighter of two stable isotopes D. None of the choices are correct.