LO1 - Heart Flashcards
What are the 3 primary functions of the heart?
1) To pump blood around your body as your heart beats.
2) Sends oxygen and nutrients to all parts of your body, and carries away unwanted carbon dioxide and waste products via blood.
3) Maintain a healthy blood pressure.
What is a double pump function?
Heart is a double pump as blood enters the heart at the same time on both sides through the atria, then contracts and pushes the blood into the ventricles through the valves.
The Cardiac Cycle.
Stage 1 is Diastole
The heart beat begins when the heart muscles relax and blood flows into the atria. Right atrium is being filled with deoxygenated blood from body and the left atrium is filling up with oxygenated blood from lungs.
The Cardiac Cycle.
Stage 2 is Atrial Systole
The atria then contract and the valves open to allow blood into the ventricles. Deoxygenated blood moves through the tricuspid valve into the right ventricle and oxygenated blood moves through the bicuspid valve to the left ventricle.
The Cardiac Cycle.
Stage 3 is Ventricular systole
The tricuspid and bicuspid valve close to stop blood flowing backwards. The ventricles then contract forcing the blood to leave the heart. The right ventricle sends blood to the lungs, left ventricle sending blood to the body.
Atrial Systole definition…
Period of atrial contraction and the valves open to allow blood into the ventricles.
Ventricular Systole definition…
Period of ventricular contraction when blood flows out of the heart.
Pulmonary Circulation
Pulmonary circulation is between the lungs and the heart. This circuit transport blood to the lungs to become oxygenated then carried back to the heart. Pulmonary artery carries deoxygenated blood and the pulmonary veins carry oxygenated blood.
Diastole definition…
Period of atrial relaxation, where the atria fill with blood.
Systemic Circulation
This circuit goes between the heart and other major organs. It transports blood around the body as well as oxygen and nutrients to the body tissues. Then carries away deoxygenated blood containing carbon dioxide and other waste materials to be expelled from the body.
Fill in the blanks summarising
Once the blood has become, OXYGENATED, the pulmonary VEIN then brings the blood back to the heart via the LEFT atrium, which pushes blood through the BICUSPID valve into the left VENTRICLE when it contracts. The bicuspid valve prevents BLOOD from flowing backwards when the left ventricle contracts. When the left ventricle contracts, the blood is pushed through the AORTIC valve into the aorta, which takes oxygenated blood to the body. The aortic valve prevents blood from flowing BACKWARDS from the AORTA.
