Blood

• Blood platelets protect the body from excessive blood loss by blocking ruptured blood vessels when we are wounded.
• Plasma makes up about 55% of the total volume of blood.
• The blood is composed of plasma, red blood cells (erythrocytes), white blood cells (leukocytes), platelets (thrombocytes).
• The circulatory system transports blood throughout the body, delivering oxygen and nutrients to cells and removing waste products.
• The plasma is mostly water, but it also contains dissolved proteins (albumin), nutrients, hormones, waste products, gases, electrolytes, and antibodies.
• Red blood cells contain hemoglobin which carries oxygen to all parts of the body.
• White blood cells make up less than 1% of the total volume of blood.
• White blood cells fight infection and disease.
• Platelets form clots that stop bleeding.
• Red blood cells contain hemoglobin which binds with oxygen molecules and carries them through the bloodstream to all parts of the body.
• White blood cells defend against infection and disease.
• Platelets play a role in clotting or coagulation of the blood.
• Red blood cells contain hemoglobin which carries oxygen around the body.
• Platelets form clots that stop bleeding if there's an injury.
• There are five types of white blood cells that play different roles in fighting infection and disease.
• Platelets play an important role in clotting or coagulation.
• High blood pressure can lead to heart attack or stroke.
• Blood pressure refers to the force exerted by blood against the walls of arteries as it flows through them.
• Blood pressure refers to the force exerted by blood against the walls of arteries as it flows through them.
• The blood must pass through the herat
• The blood must pass through the lungs
• The blood must pass through the heart twice before completing one whole circut of the body
• The blood is pumped from the right ventricle into the pulmonary trunk, which divides into two branches called pulmonary arteries that carry oxygen-poor blood to the lungs.
• Oxygenated blood then returns to the left atrium via four large veins called pulmonary veins.
• Oxygenated blood then returns to the left atrium via four pulmonary veins.
• From there, it passes through the mitral valve into the left ventricle.
• The left ventricle pumps this oxygenated blood out of the heart through the aorta, which carries it throughout the rest of the body.
• Arteries are thicker than veins because they have to withstand higher pressures when carrying blood away from the heart.
• Blood flows out of the left ventricle into the aorta, which carries it throughout the rest of the body.
• Arteries are thicker than veins because they have to withstand high pressure as they leave the heart.
• Blood pressure refers to the force exerted by blood against the walls of an artery as it flows through them.
• Veins contain valves to prevent backflow of blood when the heart contracts.
• Blood pressure refers to the force exerted by blood against the walls of the vessels as it flows through them.
• Veins are thinner than arteries because they do not need to withstand high pressure as they return deoxygenated blood back to the heart.
• Veins carry deoxygenated blood back to the right side of the heart.
• Veins carry deoxygenated blood back to the heart.
• Capillaries are very thin walls so that nutrients can easily pass through them.
• They allow for the exchange of nutrients, gases, and waste products between cells and the circulatory system.
• Blood vessels contain smooth muscle tissue that allows them to contract or relax, regulating blood flow.
• Capillaries are tiny vessels that connect arterioles to venules.