Which of the following is NOT true of proteins? a. they form muscle, skin and hair
b. they are found in food
c. they are a main source of energy
d. they are sensitive to pH and temperature

one of the most common forms of pain or discomfort we feel during strenuous exercise is a burning sensation in our lungs or muscles that goes away shortly after we cease the activity. this is caused by a build-up of lactic acid.

hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.

my teacher would say no s

i think the answer is c hope this