Lesson 1 – What is the circulatory System? The circulatory system moves material around the body Parts: Blood, heart, blood vessels It brings food and oxygen to body cells and removes cells’ wastes.

Functions of Blood Plasma Carries food, water, and chemicals to cells and wastes away from cells Platelets Parts of cells, used to form blood clots (scabs) RBCs Carry oxygen to the body WBCs Protect body from germs and foreign matter

Platelets Pieces of cells that float in the blood. They stop bleeding if a blood vessel is cut. They clump together and stick to edges of a cut. They form long sticky threads and “jam” up a cut.

Plasma Carries food and water to cells and carries wastes away. Carries chemicals around body. The “fluid” part of blood

RBCs Carry oxygen to body cells. Bright red while they carry oxygen, then dark red without oxygen

WBCs Protect body against germs and harmful things. Wrap around and break down germs, waste matter, dead cells, cels with germs, make chemicals to kill germs Body makes more white cells if needs to fight infection

BLOOD CLOTS http://www.youtube.com/watch?v=--bZUeb83uU&feature=related

Valves with DR.OZ Wow! You can understand Big Ideas here! http://videos.howstuffworks.com/sharecare/31112-dr-oz-aortic-valve-disease-video.htm

Blood Vessels 3 main types: 1. Arteries 2. Veins 3. Capillaries http://www.smm.org/heart/heart/circ.htm http://vimeo.com/12746026 3 main types: 1. Arteries Carry blood AWAY from <3 2. Veins Carry blood TOWARD <3 3. Capillaries Connect arteries to veins Allow exchange of oxygen, nutrients, and other materials b/w blood and cells

ARTERIES Carry blood away from the heart- Thickest walls Carry oxygen-rich blood to the body

VEINS Carry blood that needs oxygen back to the heart. Thinner walls than arteries

CAPILLARIES

VALVES A Faucet is a type of valve. What does a valve do???

VALVES They are flaps that act like doors to keep blood flowing in one direction. They open to allow blood to flow to the heart and close if blood begins to flow away from the heart. They are found in VEINS ONLY!!!!!!!!

DO NOW Lay your hand (palm side up) on their desk and count how many times you can open and close your hand for one minute. What is your hand doing?? What part of the body might your hand represent???

DO NOW: What are the 4 parts of blood and briefly say what each does What are 3 three types of blood vessels

THE HEART! Procedure Help the students locate their pulse points either on their wrists or necks. Ask students to place their right index and middle finger on the palm side of their left wrist. On the neck, the pulse point is located beneath the ear and jawbone. How do I find my pulse? Count the number of beats in 15 seconds. Multiply this by four (15x4=60, there are 60 seconds in one minute). This is how many times the heart beats in one minute. Have students enter this "at rest" heart rate on their chart. (Student pulse rate at rest will vary between 60 - 110 beats per minute. Adult rates are lower.) Do some exercise such as running in place, jumping jacks, or other exercise for one minute. Stop and calculate pulse again over 15 seconds. Calculate the heart rate for each activity and show this on the graph.

Parts of the Heart Heart is a double pump. Right side: Left side: Collects blood that already went to the body and sends it to the lungs Left side: Collects blood that came from the lungs and is rich in OXYGEN and sends it to the arteries to go to the body

Listen to the Heart! http://www.smm.org/heart/lessons/lesson4.htm

The HEART – Cool websites http://www.smm.org/studio3d/julie/hearthome.htm