At what temperature does the human body experience a heatstroke?

Humans can get a heatstroke @ 104 F or 40 C.

-At or greater than 104.0 °F.

Explanation:

Heat stroke or sun stroke can be defined as a severe heat illness, when  internal body temperature reaches to (or above than) 104.0 °F. Symptoms include confusion, headache, dry or red skin, and dizziness.

The main cause for heat stroke is overwhelming of thermoregulation due to excessive environmental heat, excessive exertion (heat production due to metabolic activity), or insufficient heat loss.

Thus, the correct answer is '104.0 °F.'

(a) 5142.86 m

(b) 317.5 m/s

(c) 49.3 degree C

Explanation:

m = 100 kg, Q = 1200 kcal = 1200 x 1000 x 4.2 = 504 x 10^4 J

(a) Let the altitude be h

Q = m x g x h

504 x 10^4 = 100 x 9.8 x h

h = 5142.86 m

(b) Let v be the speed

Q = 1/2 m v^2

504 x 10^4 =  1/2 x 100 x v^2

v = 317.5 m/s

(c) The temperature of normal human body, T1 = 37 degree C

Let the final temperature is T2.

Q = m x c x (T2 - T1)

504 x 10^4 = 100 x 4.1 x 1000 x (T2 - 37)

T2 = 49.3 degree C

How long can healthy lungs hold breath?

Most people can hold their breath for somewhere between 30 seconds and up to 2 minutes.

Its D

Explanation:

Sometimes your eyes are bigger than your stomach and you end up eating more than your body can handle at one time. When you eat too much, your digestive system has to work on overdrive, causing a spike in blood sugar, an upset stomach, and feelings of lethargy.

Hope this helps :)

All of the answers are the same so i believe it would be the only choice 

D is a complex sentence. it was between a. and d. the best one was d

I THINK it's Carbohydrates and cholesterol. I couldn't find a very clear answer. 

It’s I. Adrenaline, because it makes the body react more quickly and to do that your blood flow needs to go faster. It also stimulates the body to use sugar for fuel.