learning cardiovascular system with lazy hamster

made up of blood ; blood vessels and heart

helps maintain your body by caring nutrients to your cells and removing wastes from your cells

also helps regulation by carrying chemical signals called hormones throughout the body

works by heart creates pressure when it beat and this pressure moves blood through out your body

an organ made up of mostly cardiac muscle tissue ; size of your fist and in almost the center of the chest vavity

separated by thick wall to four parts :

right atrium - receive blood from body

left atrium - receive blood from lungs

right ventricle -pumps blood to lungs

left ventricle - pumps blood to body

blood travel to whole body in blood vessels

there are three main type of blood vessels :

artery - the blood vessel that carries blood away from heart ; have thick walls which contain a layer of smooth muscle ; has high pressure

veins - blood vessel that carries blood back to heart ; has connective tissue called valves that keep the blood from flowing backwards

capillaries - made up most of the blood vessels ; the smallest of the types ; extremely narrow because it allows exchanges between red blood cells and cells

there are two types of circulations :

pulmonary circulation - heart pumps blood to the lungs . In the lungs , carbon dioxide leaves the blood and oxygen enters the blood . The oxygen-rich blood then flows back to the heart .

more than just heart and blood vessels are at risk of if there is a cardiovascular problems or disease but also the whole body is at risk

1.atherosclerosis - they are the major cause of heart disease which is leading cause of death in United States . It happens when cholesterols - an animal sterol , builds up inside of the blood vessels , this causes the blood vessels. to become narrower and less elastic . and when an artery that supplies blood becomes blocked , that person has a heart disease

2.high blood pressure - sometimes atherosclerosis may caused by hypertension , which is also known as high blood pressure , it can caused heart attack and heart failure , and the higher the pressure is , the higher the risk

3.heart attack - a heart attack happens when cardiac or heart muscle cell die and part of the cardiac muscle is damaged , often caused by the arteries that deliver oxygen to the heart are blocked , with out oxygen , the cells die . And when enough cardiac muscle cells die , the heart may even stop

4.heart failure - heart failure happens when the heart cannot pump enough blood to meet the body's needs , important Organs like brain 、lungs or kidneys sometimes damaged by lack or oxygen nutrients or by the buildup of fluids or wastes

a connective tissue made up of plasma , red blood cells , platelets and white blood cells . Carries oxygen and nutrients to all parts of your bodies

plasma - the fluid part of the blood . Is a mixture of water , minerals , nutrients , sugars , proteins and other substances

res blood cells - also called RBCs for short . Take oxygen and nutrients to every cell in your body . RBCs has a special thing called hemoglobin , which give them ability to carry oxygen and give them red colors

platelets - are pieces of larger cells remain in the bone marrow , put fragments are pinched off and enter the bloodstream as platelets . Platelets only lasted for 5 - 10 days , but are super important for form a plug as soon as a bleeding start , to reduce the blood loss . Platelets Also release chemicals that react with proteins in plasma to form tiny fibers , and fibers help create a blood clot .

white blood cells - WBCs for short , and WBCs keep the body healthy by destroy every microscope particles that can make the body sick

blood did more than just supply cells with oxygen and nutrients . it also helps regulate the body temperature

when the brain senses that your temperature is rising , it signals the blood vessels in your skin to enlarge , as your blood vessels enlarge , heat from your blood vessels is transferred to your skin to lower the temperature .

every time the heart beats , it pushes the blood out of the heart and into your arteries . The force exerted by blood on the inside walls of arteries is called blood pressure

blood pressure is measured in milliliters of mercury , and usually given as two numbers . systolic pressure is the first one , it's the pressure inside large arteries when ventricle contract . The second number is the diastolic pressure , it's the pressure inside large arteries when ventricle relax

when the blood pressure is too high , it can cause heart or kidney damage