Circulatory System Notes
Functions of the circulatory system… -Carries nutrients, oxygen & other needed materials to cells
Functions of the circulatory system… -Carries carbon dioxide & other wastes away from cells
Functions of the circulatory system… -Blood helps fight disease & heal wounds.
Functions of the circulatory system… -Helps maintain body temperature & homeostasis.
The circulatory system is made up of the: Blood vessels Blood & Heart
muscular organ that pumps blood throughout the body. Heart…
right side pumps blood to lungs & left side pumps blood to body… separated by a thick muscular wall called the septum.
Upper two chambers are called the atrium (atria) & receive blood into the heart…
…the lower two chambers are ventricles that have thick muscles to pump blood out of the heart.
Upper & lower chambers are separated by valves that keep blood from flowing backward.
muscle contractions that push blood through the blood vessels. Heartbeat
You hear the valves opening & closing… when the heart muscles relax the valves open & the atria fill with blood LUB… then the ventricles contract & the valves close DUB.
Throbbing of arteries as heart beats & pumps blood… used to determine heart rate. Pulse
force with which the ventricles contract. Blood pressure
Arteries Capillaries Veins Veins Blood vessels…
Muscular blood vessels that carry blood with oxygen away from the heart. Arteries
Carries blood from heart to lungs… only artery that does not carry oxygenated blood. Pulmonary artery
largest human artery that carries blood from the heart to the body. Aorta
smallest blood vessels where substances are exchanged by the process of diffusion Capillaries
carry blood with carbon dioxide to the heart from the body. Veins…
Carries blood from lungs to heart… only vein that not carries oxygenated blood. Pulmonary vein
Superior vena cava is the largest vein in the human body.
occurs when the pressure in the blood vessels is too high… above 140/90. Hypertension (high blood pressure)
The heart has to work harder.
Can cause damage to the heart, arteries and other organs.
occur when arteries get clogged and stop the flow of blood to the heart muscles. Heart attacks
occurs when the blood supply to the brain is cut off or when a blood vessel burst causing damage to brain cells. Strokes
is a condition where artery walls thicken and restrict the flow of blood in the arteries. Atherosclerosis
Caused by high cholesterol that deposits in the arteries causing them to narrow or harden.
Can lead to heart, disease or strokes.
occur when the heart rhythm is too fast or too slow. Irregular heartbeats