which hormone is involved in the fight or flight response

HESI A2

HESI A2 Anatomy and Physiology 2023

1. Which hormone is involved in the fight or flight response?

A. Cortisol
B. Adrenaline
C. Thyroxine
D. Melatonin

Correct answer: B

Rationale: The correct answer is B: Adrenaline. Adrenaline, also known as epinephrine, is the hormone involved in the fight or flight response. It is released by the adrenal glands, preparing the body for action by increasing heart rate, dilating airways, and mobilizing energy stores. Choice A, Cortisol, is a hormone released in response to stress but is not directly involved in the fight or flight response. Choice C, Thyroxine, is a hormone produced by the thyroid gland that regulates metabolism and growth, not specifically associated with the fight or flight response. Choice D, Melatonin, is a hormone that regulates sleep-wake cycles and is not involved in the fight or flight response.

2. What does contrite mean?

A. Guilty
B. Regretful
C. Shameful
D. Pleased

Correct answer: B

Rationale: The correct answer is B: 'Regretful.' Contrite means feeling regret or remorse. Choice A, 'Guilty,' does not fully capture the meaning of contrite as it implies a judgement of culpability rather than a feeling of remorse. Choice C, 'Shameful,' is incorrect as it focuses on the emotion of shame rather than regret. Choice D, 'Pleased,' is the opposite of what contrite means, as it signifies satisfaction or happiness, which is contradictory to feeling regretful or remorseful.

3. What is stated about Benjamin Franklin's role in Daylight Savings Time?

A. Benjamin Franklin invented Daylight Savings Time.
B. Benjamin Franklin proposed the concept of Daylight Savings Time.
C. Benjamin Franklin opposed Daylight Savings Time.
D. Benjamin Franklin had no connection to Daylight Savings Time.

Correct answer: B

Rationale: Benjamin Franklin is credited with proposing the idea of Daylight Savings Time, as stated in the extract. However, it was not implemented during his lifetime. Choice A is incorrect because he proposed, not invented, Daylight Savings Time. Choice C is incorrect as there is no mention of Franklin opposing it. Choice D is incorrect as the extract clearly states his connection to the proposal of Daylight Savings Time.

4. How should a researcher test the hypothesis that practicing yoga reduces blood pressure?

A. Record the blood pressure of one male and one female participant before and after participating in a yoga class.
B. Divide 30 female participants into two groups with similar average blood pressure; test each participant’s blood pressure after participating in a yoga class.
C. Divide 30 female participants into two groups with similar average blood pressure; have one group watch television for an hour while the other takes a yoga class, record each participant’s blood pressure after the hour. Repeat daily for two weeks.
D. Start with 15 men and 15 women; have the men watch television for an hour while the women take a yoga class, record each participant’s blood pressure after the hour. Reverse, having the men take a yoga class while the women watch television.

Correct answer: B

Rationale: Option B is the most appropriate way to test the hypothesis that practicing yoga reduces blood pressure. By dividing 30 female participants into two groups with similar average blood pressure levels and testing each participant's blood pressure after participating in a yoga class, the researcher can effectively evaluate the impact of yoga on blood pressure. This design allows for a comparison between the two groups, helping to isolate the effects of yoga practice on blood pressure. Option A only involves one male and one female participant, which may not provide a representative sample. Option C introduces an additional variable of watching television, which could confound the results. Option D lacks consistency in the experimental design by switching the activities between men and women, making it difficult to attribute any observed changes solely to yoga practice.