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Tutor profile: Kassandra J.

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Kassandra J.
Recent Masters Graduate, Future Medical Student, and Current STEM Tutor
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Questions

Subject:Public Health

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Question:

How do wealth discrepancies impact health outcomes?

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Kassandra J.

Subject:Chemistry

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Question:

How much heat needs to be added (in calories) to raise the temperature of 10 grams of water (H20) from 0°C to 50°C?

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Kassandra J.

The amount of heat required is based upon two different aspects: 1) the amount of heat required to change water from its solid form to its liquid form (phase change) and 2) the amount of heat required to change the temperature from 0 to 50°C (temperature change). *Remember that the temperature change and phase change does not occur at the same time. Therefore: qtotal = q(phase change) + q(temperature change) q(phase change) = m * ΔH(phase change) q(temperature change) = m*c(specific heat)*ΔT qtotal = mΔH(melting) + mcΔT [ΔHmelting = 80 calories/gram, c = 1 cal/g-°C] - these values are dependent on substance and need to be looked up qtotal = [10g * (80 cal/g)] + [10g * 1 cal/g-°C * (50-0°C)] qtotal = 800 cal + 500 cal qtotal = 1300 calories Therefore, 1300 calories of heat would need to be added to 10 grams of water to raise its temperature from 0°C to 50°C.

Subject:Anatomy

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Question:

How does the long term physical stress response differ from the short term?

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Kassandra J.

The long term stress response is triggered by the release of cortisol, a glucocorticoid steroid, from the adrenal cortex. This is triggered by the release of Corticotropin Releasing Hormone (CRH) from the hypothalamus which causes the anterior pituitary gland to release Adrenocorticotropic Hormone (ACTH) which stimulates the adrenal cortex to release cortisol. This leads to increased blood sugar through fat and protein breakdown and decreases the immune system response and inflammation. The short term stress response is triggered by the activation of the Sympathetic Nervous System, otherwise known as the "fight-or-flight" response. This is characterized by the release of epinephrine from the adrenal medulla, as well as the release of norepinephrine. This leads to increased heart rate, increased blood flow, increased respiration, and dulled pain among other effects. This response is very fast and fleeting.

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