Tag: transport in mammals

A neurogenic heart is one where the heartbeat is initiated by nerve impulses from a ganglion, which is characteristic of many lower invertebrates. Humans have a myogenic heart, where the impulse originates in the heart muscle itself.

The pulmonary artery carries deoxygenated (impure) blood from the right ventricle of the heart to the lungs for oxygenation.

The pulmonary artery receives deoxygenated blood pumped out by the right ventricle to transport it to the lungs.

Pulmonary veins carry oxygenated blood from the lungs back to the left atrium of the heart. This is the exception to the rule that veins carry deoxygenated blood.

The Bundle of His (AV bundle) conducts the electrical impulse from the AV node to the Purkinje fibers, which then distribute the impulse to the ventricular muscle.

Oxygenated blood returns from the lungs to the left atrium of the heart via the pulmonary veins.

Stroke volume is the amount of blood pumped out of a ventricle with each individual heartbeat (systole).

The pulmonary veins carry oxygenated (pure) blood from the lungs to the left atrium (auricle) of the heart. Other options represent deoxygenated blood pathways or systemic venous return.

• Blood enters the heart through two large veins, the inferior and superior vena cava brought from different parts of the body.
• This oxygen-deficient blood from the body is emptied into the right atrium of the heart which is further pumped to the right ventricle. 
• As the right ventricle contracts, blood is pumped into the pulmonary artery and to the lungs where it is oxygenated.
• Thus, the pulmonary arteries carry deoxygenated blood from the right ventricles to the lungs. So, the correct answer is 'Deoxygenated blood to the lungs'.