During the embryonic development of most animals, what is the first system to form?

• the nervous system

• the respiratory system

• the digestive system

• the circulatory system

The dog's digestive system has developed to take food in, process it, and excrete it, all in a period of about ___

• two hours

• six hours

• two days

• six days

Approximately how long do cows take to digest their food?

• 8 hours

• 28 hours

• 80 hours

• 8 days

Cows have microorganisms in their guts that help break down which molecule?

• starch

• amino acid

• cellulose

• sucrose

What is the technical term for an animal that eats food of both plant and animal origin?

• herbivore

• carbivore

• pluravore

• omnivore

A human adult's small intestine, where most nutrient absorption happens, has an average length of about ___

• 70 centimeters (2 feet)

• 2 meters (7 feet)

• 4 meters (13 feet)

• 7 meters (23 feet)

The small intestine has a surface area of 250 square meters, which is about the size of ___

• a ping pong table

• a tennis court

• a football field

• a polo field

Bread is mostly composed of starch, which breaks down into ___

• glucose

• fructose

• sucrose

• galactose

Which enzyme, secreted by glands in the mouth, is designed to break down starch into glucose?

• pepsin

• gastric lipase

• trypsinogen

• salivary amylase

Tags

NGSS.MS-LS1-7

Which muscular tube connects the throat (pharynx) with the stomach?

• the trachea

• the esophagus

• the epiglottis

• the duodenum