SLO 1.1 - Practice - Homeostasis

If the environment gets cold, we will often shiver in order to:

• keep body temperature the same as the external temperature
• decrease body temperature
• increase body temperature
• regulate blood pressure

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The maintenance of an organism’s internal environment is called:

• compensating
• homeostasis
• balancing
• routine

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Homeostasis

• allows for a wildly fluctuating internal environment
• is impossible in vertebrates
• is the maintenance of a relatively stable internal environment and often incorporates a form of feedback regulation
• is the maintenance of a relatively stable external environment and often incorporates a form of feedback regulation

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Why is the sensation of thirst important to maintaining homeostasis?

• Water removed by the kidneys must be replaced

• Oxygen cannot diffuse into cells if a person is dehydrated

• Water molecules are needed to carry carbon dioxide waste to the kidneys

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The diagram best illustrates the concept of

• Recombination

• Feedback

• Digestion

• Active transport

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The pancreas produces one hormone that lowers blood sugar level and another that increases blood sugar level. The interaction of these two hormones most directly helps humans to

• digest needed substances for other body organs.

• dispose of wastes formed in other body organs.

• maintain a balanced internal environment.

• increase the rate of cellular communication.

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The ability of the human body to keep blood-sugar levels within a fairly narrow range despite the intake of meals high in carbohydrates is an example of

• active transport

• digestion

• homeostasis

• genetic recombination

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The two types of feedback systems that help organisms maintain homeostasis are:

• positive and negative 
• receptor and effector
• static and dynamic
• minor and major

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Maintaining body temperature is an example of a:

• negative feedback loop
• positive feedback loop

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Which of the following scenarios describes a positive feedback mechanism?

• After childbirth, high levels of prolactin induce lactation in the mother. During nursing, infant suckling triggers the release of more prolactin, which further stimulates lactation.

• After eating, blood glucose levels rise, stimulating the release of insulin from the pancreas. Insulin causes cells to uptake glucose from the blood, lowering blood glucose levels.

• several hours after a meal, blood glucose levels begin to drop, prompting the pancreas to secrete glucagon. Glucagon causes the liver to convert stored glycogen into glucose, raising blood glucose levels.

• During exercise, an increase in body temperature causes the body to produce sweat. As the sweat vaporizes, the body cools down due to evaporative cooling.

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