6.3 Stress & Caffeine*

2.

What does adenosine do in the brain?

Builds up as we use energy, which makes you tired
Indicates that we are stressed
Indicates that we are sick

Correct Answer

A. Builds up as we use energy, which makes you tired

Explanation

Adenosine is a molecule that accumulates in the brain as we use energy. It acts as a neurotransmitter and binds to specific receptors, causing drowsiness and promoting sleep. Therefore, as adenosine builds up, it signals to the brain that it needs rest and makes us feel tired. This explains why we feel more fatigued after a long day of physical or mental activity.

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3.

This person probably has:

Low levels of adenosine
High levels of cortisol
Low levels of cortisol

Correct Answer

A. High levels of cortisol

Explanation

This person probably has high levels of cortisol. Cortisol is a hormone released by the adrenal glands in response to stress. High levels of cortisol can indicate chronic stress, anxiety, or an overactive adrenal gland. It can lead to symptoms such as weight gain, high blood pressure, and impaired immune function.

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4.

Caffeine blocks the receptors for what hormone?

Adenosine
Adrenaline
Estrogen

Correct Answer

A. Adenosine

Explanation

Caffeine blocks the receptors for adenosine. Adenosine is a hormone that promotes relaxation and drowsiness. By blocking its receptors, caffeine prevents adenosine from binding and exerting its effects, leading to increased alertness and reduced fatigue. This is why caffeine is commonly consumed to stay awake and improve focus.

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5.

The caffeine in this beverage will help a person stay up late because:

Caffeine blocks adenosine from being received in the brain
Caffeine increases the amount of adenosine
Caffeine increases our cortisol levels

Correct Answer

A. Caffeine blocks adenosine from being received in the brain

Explanation

Caffeine blocks adenosine from being received in the brain. Adenosine is a neurotransmitter that promotes sleep and relaxation. When caffeine is consumed, it binds to the adenosine receptors in the brain, preventing adenosine from binding to these receptors. As a result, the person feels more alert and awake.

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6.

Too much stress is dangerous because:

The body has too much adenosine
The body does not have time to heal, rest and digest
The body does not have enough cortisol

Correct Answer

A. The body does not have time to heal, rest and digest

Explanation

When a person is under too much stress, their body does not have enough time to heal, rest, and digest. Stress activates the body's fight-or-flight response, which diverts resources away from these essential functions. Instead, the body focuses on immediate survival, such as increasing heart rate and blood pressure. This prolonged state of stress can lead to various health problems, including weakened immune system, digestive issues, and increased risk of chronic diseases. Therefore, it is important to manage stress levels and allow the body time to recover and perform these vital functions.

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7.

Which of the following is a true statement about adenosine?

Adenosine gives us more energy
Adenosine builds up as we use energy
Adenosine creates high levels of stress

Correct Answer

A. Adenosine builds up as we use energy

Explanation

Adenosine is a molecule that is produced in the body as a byproduct of energy consumption. As we use energy, adenosine gradually accumulates in our system. This build-up of adenosine acts as a signal to the body that it needs to rest and recover. Therefore, the statement "adenosine builds up as we use energy" is true.

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8.

Why is the cortisol triggered by stress helpful?

It gives the body extra energy to respond to stress
It helps the body rest and digest
It helps the body calm down

Correct Answer

A. It gives the body extra energy to respond to stress

Explanation

Cortisol is a hormone released in response to stress. It helps the body by providing extra energy to deal with the stressor. This energy boost allows the body to respond effectively to the stress, whether it's by fighting, fleeing, or taking necessary action. By increasing blood sugar levels and suppressing non-essential functions, cortisol helps the body stay alert and focused during stressful situations. Therefore, it can be said that cortisol triggered by stress is helpful because it gives the body the energy it needs to respond to the stressor.

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9.

Caffeine is making this guy's brain think that he is:

NOT tired, because his brain is receiving more adenosine
NOT tired, because caffeine blocks his brain from receiving adenosine
Tired, because he is using too much energy

Correct Answer

A. NOT tired, because caffeine blocks his brain from receiving adenosine

Explanation

Caffeine is a stimulant that blocks the receptors in the brain that receive adenosine, a neurotransmitter responsible for promoting sleep and relaxation. When these receptors are blocked, the brain does not receive the signal that it is tired, leading to a feeling of wakefulness and alertness. Therefore, the correct answer is that caffeine blocks the brain from receiving adenosine, making the person not tired.

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6.3 Stress & Caffeine*

Adrenaline triggers a sympathetic response by_______________ heart rate in response to stress.

Quiz Preview

What does adenosine do in the brain?

This person probably has:

Caffeine blocks the receptors for what hormone?

The caffeine in this beverage will help a person stay up late because:

Too much stress is dangerous because:

Which of the following is a true statement about adenosine?

Why is the cortisol triggered by stress helpful?

Caffeine is making this guy's brain think that he is: