buildhost.blogg.se - Essential anatomy 3 heart quiz

Pulmonary valve: Prevents the backflow of blood as it is pumped from the right ventricle to the pulmonary artery.

Mitral valve: Prevents the backflow of blood as it is pumped from the left atrium to the left ventricle.

Aortic valve: Prevents the backflow of blood as it is pumped from the left ventricle to the aorta.

Heart valves are flap-like structures that allow blood to flow in one direction.

Systole phase: The ventricles contract and pump blood to the arteries.

Diastole phase: The heart ventricles are relaxed and the heart fills with blood.Below are the two phases of the cardiac cycle: The Cardiac cycle is the sequence of events that occurs when the heart beats. Sinoatrial Node: A section of nodal tissue that sets the rate of contraction for the heart.Purkinje Fibers: Fiber branches that extend from the atrioventricular bundle.Atrioventricular Node: A section of nodal tissue that delays and relays cardiac impulses.Atrioventricular Bundle: A bundle of fibers that carry cardiac impulses.

Heart nodes and nerve fibers play an important role in causing the heart to contract. Endocardium: The inner layer of the heart.Ĭardiac conduction is the rate at which the heart conducts electrical impulses.Myocardium: The muscular middle layer of the wall of the heart.Epicardium: The outer layer of the wall of the heart.Ventricles: Lower two chambers of the heart.Atria: Upper two chambers of the heart.