Vertebrate Cardiovascular System

There are three main types of blood vessels in vertebrates: arteries, veins, and ____.

Capillaries

____ carry blood away from the heart.

Arteries

Arteries are generally ____ muscular and ____ elastic than veins of equivalent sizes.

More, more

Mammalian heart has three layers of tissues: epicardium, ____, and endocardium.

Myocardium

The cardiovascular system in shark has:

One circuit

Which of the following chambers has the thickest wall?

Left ventricle

Gas exchange happens in the:

Capillaries

Cardiac muscle receives nutrients from:

Coronary arteries

Which one of the following blood vessels carries oxygen-rich blood?

Pulmonary veins

Which of the following arteries carry oxygen-rich blood?

Aorta and carotid artery (A and B)

The resting heart rate of humans is general in the rage of ____.

60-100 bpm

In sharks, oxygen-poor blood is carried by veins back to the atrium via a thin-walled sac called ____.

Sinus venosus

Which of the following is true about veins and arteries?

Veins are less elastic than arteries of equivalent size.

Mammalian hearts have the following layers from innermost to outermost.

Endocardium, myocardium, epicardium

Among all the blood vessels, which of the following is true for the capillaries?

Largest surface area and thinnest walls (A and B)