General Biology Exam 3 Part 4

How many chambers are typically found in the heart of humans?

Four

Which chambers of the heart respectively receive and pump oxygen-poor blood?

Right atrium and right ventricle

Imagine that you are walking to class and a person on a bicycle comes very close to hitting you. Your heart begins to beat faster. Which of the following structures is responsible for this reaction?

The SA node

Which of the following correctly lists the sequence of blood flow in mammals?

Venae cavae, right atrium, right ventricle, pulmonary arteries, lungs, pulmonary veins, left atrium, left ventricle, aorta

Bone consists of

a mixture of hardened collagen and minerals.

In many animals, fat is stored in specialized cells in the ________.

adipose tissue

After surgical removal of the gallbladder, a person might need to limit his or her dietary intake of

fat

Food moves along the digestive tract as the result of contractions by ________.

smooth muscle

Muscle cells are organized to perform specific types of contractions within a tissue. Which of the following is a characteristic of smooth muscle?

spindle-shaped cells with a single nucleus

Cardiac muscle cells are both ________.

striated and interconnected by intercalated disks