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Anatomical position is a stance in which a person stands erect with the feet flat on the floor and close together, arms at the sides, and the palms and face directed forward. This position provides a precise and standard frame of reference for anatomical description and dissection. Without such a frame of reference, to say that a structure such as the sternum, thyroid gland, or aorta is "above the heart" would be vague, since it would depend on whether the subject was standing, lying face down, or lying face up. From the perspective of anatomical position, however, we can describe the thyroid as superior to the heart, the sternum as anterior to it, and the aorta as posterior to it. These descriptions remain valid regardless of the subject's position.
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Terms in this set (20)
which of the following best describes the term homeostasis?
Balance
when a person does strenuous, small blood vessels (capillaries) near the surface of the skin increase in diameter. This change allows the body to be cooled. These statements best illustrate:
Homeostasis
How many examples of homeostasis can be found in the human body
Too many to count
The most immediate response to a high level of blood sugar in a human is an increase in the
Release of insulin
the 4 most common example of homeostasis in the body are:
Body temperature, blood pressure, blood sugar, ans gas concentration
the pancreas produces one hormone that lowers blood sugar level and another that increases blood sugar level. the interaction of these 2 hormones most directly helps humans to
Maintain a balance internal environment
when the medulla oblongata (brain) is stimulated because your CO2 level is too high, it sends a message to which of the following to increase activity:
Heart and lungs
Feedback interactions in the human body are important because they
keep the internal body environment within its normal range
the ultimate goal of homeostasis is:
to allow a persons internal environment to stay regardless of the external environment
which statement does not describe an example of a feedback mechanism that maintains homeostasis? (remember positive and negative)
the guard cells close the opening in leaves, preventing excess water loss from a plant
which of the following is true regarding negative and positive feedback system?
Positive systems amplify each other and create more of a product
which like in the graph below best illustrates an effect of the carbon dioxide level in the blood in breathing rate before, during, and after a period of exercise?
line A
which type of feedback system is more common?
Negative
which situation is not an example of the maintenance of a equilbrium in an organism?
Water passes into an animal cell causing it to swell
which of the following occurs during the negative feedback loop of temperature regulation during an episode of hypothermia?
Vasoconstriction
The diagram below represents what can happen when homeostasis in an organism is threatened. which statement provides a possible explanation for these events?
Some specialized cells mark and other cells engulf microbes during immune reactions
what body structure houses the receptors that signal if the blood pressure rising or falling?
Arteries
this diagram illustrates part of what?
a feedback mechanism
if the brain has been signaled that the blood pressure is too low, which of the following will occur?
A and C
shivering is a part of which of the following homeostatic mechanism:
thermoregulation
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