Internal respiration refers to: a) atmospheric air coming into the lungs. b) gas exchange between the lungs and the blood. c) gas exchange in the atmosphere. d) gas exchange between the blood and body tissues. e) cellular respiration.

Gas exchange between the blood and body tissues. E.g cellular respiration.

Explanation:

As the name implies, internal respiration is the process of diffusing oxygen from the blood into the intestinal fluids and cells. Carbon dioxide is also difussed out.

Oxygen is released from blood cells in response to the oxygen concentration in the capillaries of the blood vessels.

However, cellular respiration is process of converting the oxygen along with glucose into ATP.

the answer is 1. photosynthesis. glad to

endo:

regulates body hormones, aldosterone, vasopressin

neural:

signal, regulates body using electric signals, reflex

endo has to do with hormones; aldosterone and vasopressin are both hormones. i also had this question and got it right : d