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- 1. Multiple ChoiceThe two types of feedback systems that help organisms maintain homeostasis are:positive and negativereceptor and effectorstatic and dynamicminor and major
- 2. Multiple ChoiceMaintaining body temperature is an example of a:negative feedback looppositive feedback loop
- 3. Multiple Choice
When glucose levels in the blood rise, your brain sends a signal to your pancreas. The pancreas releases insulin, which opens channels in cell membranes to allow glucose to enter the cell, lowering blood sugar levels. This is an example of a:
Positive Feedback Loop
Negative Feedback Loop
- 4. Multiple Choice
An example of a negative feedback loop is ...
Blood glucose regulation
Blood pressure regulation
Thermoregulation
All of the above
- 5. Multiple Choice
An example of a positive feedback loop is ____________.
Childbirth
Blood Pressure regulation
Body Temperature regulation
All of the above
- 6. Multiple ChoiceHomeostasisallows for a wildly fluctuating internal environmentis impossible in vertebratesis the maintenance of a relatively stable internal environment and often incorporates a form of feedback regulationis the maintenance of a relatively stable external environment and often incorporates a form of feedback regulation
- 7. Multiple ChoiceIf the environment gets cold, we will often shiver in order to:keep body temperature the same as the external temperaturedecrease body temperatureincrease body temperatureregulate blood pressure
- 8. Multiple Choice
What type of feedback loop is shown?negativeneutralpositive - 9. Multiple ChoiceWhat type of feedback loop is shown?PositiveNeutralNegative
- 10. Multiple ChoiceHumans have ___ for body temperature, blood glucose concentrations, electrolyte concentrations, pH levels, tendon tension and variables.positive feedback mechanismsset pointsa wide internal rangeno regulation
- 11. Multiple Choice
When you get cut, your skin cells release hormones that signal platelets to come and stop the bleeding. Platelets then release more hormones that signal even more platelets to help stop bleeding. The hormone signals continue until the cut is closed. This is an example of what type of feedback?
Positive Feedback Response
Negative Feedback Loop
- 12. Multiple ChoiceRapid growth during puberty causes your body to release more and more growth hormones. As you grow, more and more growth hormones are released until puberty is reached, and then the hormones stop.Positive Feedback ResponseNegative Feedback Loop
- 13. Multiple Choice
If the calcium in your blood decreases below homeostasis levels, a gland in the brain will sense the decrease and send a chemical message to your bones. Your bones will release calcium into the blood, bringing blood calcium levels back up. This is an example of what type of feedback?
Positive Feedback Response
Negative Feedback Loop
- 14. Multiple Choice
As you get dehydrated, your blood becomes thicker and harder to pump. Your kidneys will respond by stopping urine production, sending the water from urine into your bloodstream to thin your blood back to normal level. This is an example of what type of feedback?
Positive Feedback Response
Negative Feedback Loop
- 15. Multiple ChoiceThis organ produces the hormones that help regulate blood glucose levels.pancreasliversmall intestinegall bladder
- 16. Multiple ChoiceWhat hormone is produced in the pancreas that raises blood sugar?InsulinGlucagonKetonesGlucose
- 17. Multiple Choice
Detects change and sends a message to the control center
receptor
control center
effector
regulation
- 18. Multiple Choice
Receives the message from the receptor and coordinates a response
control center
effector
glucagon
homeostasis
- 19. Multiple Choice
The organ/cells that carry out the response
control center
receptor
thermoregulation
effector
- 20. Multiple Choice
The temperature regulation center in the brain of a human
hypothalamus
thermoregulation
receptor
negative feedback
- 21. Multiple Choice
_____________ is released by your pancreas when blood glucose levels get too high.
glucose
glucagon
oxygen
insulin
- 22. Multiple Choice
The body’s automatic tendency to maintain a constant and optimal internal environment is termed
positive feedback
negative feedback
homeostasis
thermoregulation
- 23. Multiple Choice
An example of a properly functioning homeostatic control system is seen when
The core body temperature of a runner rises gradually from 37°C to 45°C.
The kidneys excrete salt into the urine when dietary salt levels rise
A blood cell shrinks when placed in a solution of salt and water
The level of glucose in the blood is abnormally high whether or not a meal has been eaten
- 24. Multiple Choice
An example of a homeostatic response is
An increase in body temperature that results from involuntary shivering
An increase in body temperature that results from exercise.
The rising sun causing an increase in body temperature in a stationary animal.
An increase in body temperature that results from fever.
- 25. Multiple Choice
In a positive-feedback system, where hormone A alters the amount of protein X,
An increase in A always produces an increase in X, which results in an increase in A.
An increase in X always produces a decrease in A, which results in a decrease in X.
A decrease in A always produces an increase in X, which results in an increase in A
A decrease in X always causes a decrease in A, which causes an increase in X.
- 26. Multiple Choice
In a cold environment that supports life, an ectotherm is more likely to survive an extended period of food deprivation than would an equally sized endotherm because the ectotherm
Maintains a higher basal metabolic rate
Expends more energy per kilogram of body mass than does the endotherm
Invests little energy in temperature regulation
Has greater insulation on its body surface
- 27. Multiple Choice
Positive feedback differs from negative feedback in that
Positive feedback benefits the organism, whereas negative feedback is detrimental
The positive feedback’s responses are in the same direction as the initiating stimulus rather than opposite to it
Positive feedback results in increases in some parameter (such as body temperature), whereas negative feedback results only in decreases to the parameter.
Positive feedback systems have control centers that are lacking in negative feedback systems
- 28. Multiple Choice
During mammalian labor and delivery, the contraction of uterine muscles is enhanced by oxytocin. This is an example of
A negative feedback system
A hormone that acts in an antagonistic way with another hormone
A hormone that is involved in a positive feedback loop
Signal transduction immediately changing gene expression in its target cells
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