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Question

Question 1

A reaction in this process (diagram above) is the removal of excess water. What was the stimulus directly causing this reaction?

 

(1 point)
Responses

drinking water
drinking water

water absorption
water absorption

Blood Volume decreases
Blood Volume decreases

blood volume increases
blood volume increases
Question 2
When the level of carbon dioxide in the blood is too high, the excess carbon dioxide reacts with water and produces carbonic acid. The carbonic acid causes the pH to become more acidic. When the blood pH becomes too acidic, chemoreceptors in the brain instruct the body to react and maintain homeostasis in blood pH. Which of these responses by the body would eliminate the excess carbon dioxide and help maintain homeostasis in the blood pH?(1 point)
Responses

increasing glucose levels in the blood

 

increasing glucose levels in the blood  

Increasing body temperature by shivering
Increasing body temperature by shivering

Breathing mo…

Answer 1

Here are the answers to the questions based on the information provided:

Question 1:
The question asks for the direct stimulus causing the reaction of removing excess water. The most appropriate response from the options provided is:

• Blood Volume decreases.
  A decrease in blood volume can trigger a physiological response to retain water and maintain homeostasis.

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Question 2:
The question describes a situation where high levels of carbon dioxide in the blood lead to increased acidity due to the formation of carbonic acid. The body needs to eliminate excess carbon dioxide to maintain homeostasis. The correct response would be:

• Breathing more rapidly (or deeper).
  This option is implied but not fully stated in your provided options. Increasing the rate and depth of respiration helps to expel carbon dioxide from the body, thus raising the blood pH back to normal levels.

Note: If "Breathing more" was meant to be one of the options listed, please select that. If the full option doesn’t appear, it could be worth clarifying or checking against the options given.

Answer 2

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Question

This diagram shows a feedback loop in the human body that helps maintain homeostasis. Which of the following is the most likely function of this feedback loop?

(1 point)
Responses

regulation of calcium levels in the blood
regulation of calcium levels in the blood

conversion of calcium to PTH
conversion of calcium to PTH

storage of calcium in the kidney
storage of calcium in the kidney

breakdown of calcium in the small intestine
breakdown of calcium in the small intestine
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Answer 3

The question refers to a feedback loop in the human body that helps maintain homeostasis, specifically in relation to calcium levels. Based on the options provided, the most likely function of this feedback loop is:

• Regulation of calcium levels in the blood.

This choice aligns well with the general understanding of hormonal feedback loops related to calcium homeostasis, involving hormones such as parathyroid hormone (PTH) and calcitonin, which work to regulate calcium concentrations in the bloodstream.

Answer 4

Glucose is a form of sugar found in the blood. Cells use glucose as a source of energy, but too much or too little can cause serious health issues. So, the body uses the hormone insulin to regulate glucose in the blood. Insulin helps maintain glucose levels in the blood. If blood glucose levels got very high, what would you expect to see happen to insulin levels?(1 point)
Responses

Insulin levels would decrease
Insulin levels would decrease

insulin levels would not change
insulin levels would not change

insulin levels would increase
insulin levels would increase
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Answer 5

If blood glucose levels get very high, the body responds by increasing the secretion of insulin to help lower these glucose levels. Therefore, the most appropriate response to the question is:

• Insulin levels would increase.

This increase in insulin facilitates the uptake of glucose by cells, helping to stabilize blood glucose levels.

Answer 6

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Question

Students were asked to design a lab that investigated the relationship between heart rate and exercise. Heart rate was determined by recording the pulse rate in beats per minute. The students hypothesized that increased exercise results in an increased heart rate. The class results for the experiment are shown above. 

The change in heart rate that occurs between 1 and 5 minutes of exercise is an adaptation that...

(1 point)
Responses

results in the production of more ATP in muscle cells
results in the production of more ATP in muscle cells

slows the destruction of enzymes involved in respiration of muscle cells. 
slows the destruction of enzymes involved in respiration of muscle cells. 

increases the rate at which carbon dioxide is carried to the muscle cells
increases the rate at which carbon dioxide is carried to the muscle cells

reduces the rate at which oxygen is carried to the muscles cells
reduces the rate at which oxygen is carried to …

Answer 7

Given the context of the question and the physiological responses of the body to exercise, the change in heart rate that occurs between 1 and 5 minutes of exercise primarily relates to the increased demand for energy and oxygen by the muscle cells.

Therefore, the most appropriate response is:

• Results in the production of more ATP in muscle cells.

Increased heart rate during exercise enhances blood flow, delivering more oxygen and nutrients to the muscles, which in turn supports higher ATP production necessary for sustained physical activity.

Answer 8

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Question
Biological systems react to stimuli, for example hot conditions. The reaction starts with sensors, followed by controls, and then effectors. Match the components of a body temperature feedback loop according to this basic model by matching the number (1,2,3) to the appropriate location in the feedback loop (A, B, C)(3 points)
Put responses in the correct input to answer the question. Select a response, navigate to the desired input and insert the response. Responses can be selected and inserted using the space bar, enter key, left mouse button or touchpad. Responses can also be moved by dragging with a mouse.
1. temperature regulatory center in brain
2. nerve cells in skin and brain
3. sweat gland throughout the body
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Answer 9

Based on the components of a body temperature feedback loop and their respective functions, here's how they would match up:

• A. Sensors: 2. nerve cells in skin and brain
  These nerve cells detect changes in temperature (stimuli) from the environment.

• B. Control Center: 1. temperature regulatory center in brain
  This center, usually referred to as the hypothalamus, processes the information received from the sensors and determines the necessary response.

• C. Effectors: 3. sweat gland throughout the body
  The sweat glands are responsible for carrying out the response, which in this case is to produce sweat to help cool the body down.

So the final matching would be:

• A → 2
• B → 1
• C → 3

Answer 10

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Question
A student walks to school in the morning when the outside temperature is 60º F. when the same student walks home after school, the outside temperature has dropped to 35ºF. In this situation, how is thermal homeostasis maintained?(1 point)
Responses

The student begins to sweat as a positive feedback mechanism to reduce the core body temperature. 
The student begins to sweat as a positive feedback mechanism to reduce the core body temperature. 

The student begins to shiver as a negative feedback mechanism to increase the cord body temperature
The student begins to shiver as a negative feedback mechanism to increase the cord body temperature

The student's breathing rate slows as a positive feedback mechanism to deliver more oxygen to the lungs
The student's breathing rate slows as a positive feedback mechanism to deliver more oxygen to the lungs

The student's heart rate drops as a negative feedback mechanism to deliver less oxygen to the lungs.
T…

Answer 11

In response to a drop in external temperature from 60º F to 35º F, the body would attempt to maintain thermal homeostasis by generating heat. In this scenario, the appropriate response is:

• The student begins to shiver as a negative feedback mechanism to increase the core body temperature.

Shivering is a physiological response that generates heat through muscle activity, helping to raise the body’s core temperature when it is exposed to cold conditions.