SCI

• Myocardium is the heart muscle, which is strong and thick.
• Pericardium is a protective sac of connective tissue that covers the heart.
• Septum is the middle that separates the right and left sides of the heart.
• Right side of the heart carries deoxygenated blood, while the left side carries oxygenated blood.
• Atria receive blood from the different parts of the body, while the ventricles send blood to the different parts of the body.
• Valves guard the openings between the atria and the ventricles.
• Upper chambers and lower left chambers are separated by a valve called bicuspid valve.
• On the right side of the heart, the tricuspid valve separates the upper and lower chambers.
• Aortic valve is the valve that opens toward the aorta, the largest artery in the body.
• Pulmonary valve is the valve that opens to the pulmonary artery, an artery that goes to the lungs.
• The heart cycle, also known as cardiac cycle, consists of two heart sounds, "lub-dub".
• The first sound, lub, is heard when the atrioventricular valves (bicuspid and tricuspid) close.
• The second sound, dub, is heard when the semilunar valves (aortic and pulmonary) close.
• The two heart sounds are considered one heartbeat.
• A healthy adult heart usually beats 72 times in a minute.
• The heart rate can be heard by an instrument called stethoscope.
• Electrocardiogram, also known as EKG or ECG, is a test that records the electrical activity of the heart.
• There are three kinds of blood vessels - artery, vein, and capillary.
• Artery carries blood away from the heart.
• Vein carries blood toward the heart.
• Capillary is the smallest blood vessel that allows only a single pile of blood cell to pass through.
• The exchange of gases, nutrients, wastes and hormones happens in the Capillaries.