Fight-or-flight mechanisms

Homeostasis mechanisms

Input mechanisms

Feedback mechanisms

Correct

The body uses feedback mechanisms. When concentrations of hormones, enzymes, or fluids are too high, for example, the body responds to turn off production of even more of those hormones, enzymes, or fluids. Conversely, when concentrations area lower, the body uses that feedback to turn on the production of more.

adrenaline.

glycogen.

glucagon.

insulin.

Correct

Insulin is the hormone produced by the pancreas and released when blood sugar is higher than normal. Glucagon is the opposite hormone, used when blood sugar is too low, and more must be freed from reserves of glycogen

Carbohydrates

Lipids

Nucleic acids

Proteins

Incorrect

Carbohydrates are compounds made primarly of carbon, hydrogen, and oxygen that store the most energy. Generally, these are known as sugars. These molecules are required for cellular respiration and ATP production. Lipids and fats store energy, but are not used in ATP production. Proteins do not store energy and instead provide the raw materials for the body to build other molecules, called amino acids.

Esophagus

Stomach

Large intestine

Small intestine

Correct

The majority of nutrient absorption occurs in the small intestine, and specifically in the duodenum. The esophagus connects the mouth to the stomach, and the stomach is the site of chemical digestion, but not the absorption of nutrients.

kidney.

gall bladder.

urethra.

pancreas.