Why would you predict that the blood carbon dioxide levels in a pregnant woman would fall?
A. The fetus is removing carbon dioxide from her blood.
B. She has trouble breathing due to the expanding uterus.
C. Pregnancy creates a favorable concentration gradient between the fetal and maternal blood.
D. The bronchial tubes relax.
E. The maternal oxygen levels are also falling.
Answer: C
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Four of the five answers listed below are produced by the same germ layer. Select the exception
a. nervous system b. muscle system c. circulatory system d. reproductive system e. urinary system
The letter “D” in the above figure represents
a. humerus b. pectoral girdle c. skull d. sternum e. pelvic girdle
Damage to which type of sensory receptor would lead to an impaired detection of food?
a. mechanoreceptors b. proprioceptors c. thermoreceptors d. exteroceptors e. interoceptors
Myosin II is found in skeletal muscle and the contractile ring. It is a two-headed myosin with tails that can form thick filaments. Other myosins such as myosin I or myosin V do not form thick filaments and yet are still capable of producing movement along actin filaments. To what do the tail(s) of myosin I or myosin V bind?
a. Cargo such as membrane vesicles or intermediate filaments b. Centrosomes c. Chromosomes d. Tubulin