The anatomical structure identified with the
letter "R" in the figure above is the
a. cardiac muscle.
b. pulmonary veins.
c. inferior vena cava.
d. right atrium.
e. heart apex.
A
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When molecules diffuse, they move ________
a. down their own concentration gradient unless there are other molecules also diffusing in the vicinity b. up their own concentration gradient unless there are other molecules also diffusing in the vicinity c. up their own concentration gradient without regard to the gradients of other molecules d. down their own concentration gradient without regard to the gradients of other molecules
The development of vaccinations began when Edward Jenner noticed that ________
a. people who had earlier exposure to cowpox did not develop smallpox b. people who drank water from a particular public water pump developed cholera c. bacteria removed from a sick animal would cause the same illness if injected into a healthy animal d. rats were always present when people contracted bubonic plague
Consider the figure illustrating the two major classes of hormones and their actions. Which class of hormones would you expect to be ideally suited for long-term processes such as growth and development?
A) protein hormones, because they can relay messages B) steroid hormones, because they can turn specific genes on or off C) protein hormones, because they cannot cross cell membranes D) steroid hormones, because they can diffuse across cell membranes
Maxillae are used to bite and grind food
____________________ Indicate whether the statement is true or false.