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Circulatory System
The circulatory system is actually two systems combined: the cardiovascular system and the
lymphatic system
Lymphatic System
This is a group of organs and tissues that collect the fluid the leaks from blood and returns it to the blood.
The leaked fluid is called lymph
It is an “open” system and lymph can move in and out of the vessels
It is also part of the body’s defenses against disease.
Cardiovascular System
Your heart, blood and blood vessels make up the cardiovascular system that transports blood around your body
Blood is the fluid that carries gases, nutrients and wastes through the body.
It is a “closed” system, the blood is carried in vessels that form a loop
How do the systems work together?
Every time your heart pumps, a little fluid is forced out of the walls of the tiniest blood vessels, the capillaries and the remaining fluid is collected by lymph capillaries.
The lymphatic system is where white blood cells mature. Some of these white blood cells stay in the lymphatic system where they attack invading pathogens.
Homeostasis
How does the cardiovascular system help maintain homeostasis?
The blood maintains homeostasis by transporting hormones, nutrients and oxygen to cells and by carrying wastes away from cells.
The circulation of blood also helps homeostasis – when the body heats up, vessels get wider to allow it to rise closer to the skin and cool.
When the body is cold, the blood vessels near the skin get narrower, this keeps the blood closer the internal organs, where it is warmer.
Lymphatic System
Structures: made up of lymph nodes, lymph vessels, bone marrow, tonsils, thymus and spleen
Lymph nodes are small, bean shaped organs that remove pathogens and dead cells.
Lymph nodes are concentrated in the neck, armpits and groin
Lymphatic System
Label the missing ones on your page:
“Body Protectors”
In the event of an infection (bacteria or virus – pathogen – a disease producing agent), these white blood cells multiple and fight the infection
White blood cells attack
video
Lymphatic System
Lymph vessels – thin walled vessels that return lymph back to lymph nodes
Bone marrow – blood cells are produced
Tonsils – are small lymphatic organs at the back of your throat.
– They help defend your body against infection
Lymphatic System
Thymus and Spleen – these are organs in the body that house the white blood cells. From the thymus, and spleen, these cells travel all throughout the body to fight infections
Video – Crash Course Lymphatic System
Cardiovascular System
Structures - Made up of heart, blood vessels, and blood
Cardiovascular System It is known as a Closed system—blood
stays inside the vessels
Heart
The pump that sends blood around your body. It is about the size of your fist.
The heart contracts and squeezes the blood in it, this squeezing creates pressure that pushes blood through the body.
The heart has a left and right side, separated by a wall
There are two chambers of each side of the heart
Heart
In between the chambers, are valves that open and close
These valves prevent blood from flowing backwards and make the “lub-dub” sound of a beating heart
Heart video: How the heart works
Blood Vessels
These are the tubes that carry your blood
There are 3 types: arteries, capillary and veins
3 Types of Blood Vessels
Arteries—move blood away from the heart
They have thick walls with a layer of smooth muscle
Each heart beat pumps blood into your arteries at high pressure – this is your blood pressure
3 Types of Blood Vessels
Veins—move blood toward the heart
Valves keep the blood from flowing backwards
3 Types of Blood Vessels
Arteries—move blood away from the heart (usually oxygen rich)
Veins—move blood toward the heart (usually low in oxygen, except pulmonary veins)
Capillaries—
microscopic blood
vessels that connect
arteries & veins
Functions of the Blood
Carries oxygen from lungs to all body cells & removes carbon dioxide from the cells
Functions of the Blood
Carries waste products of cell activity to kidneys to be removed from the body
Functions of the Blood
Transports nutrients from digestive system to body cells
Functions of the Blood
Materials in blood help fight infection and heal wounds (white blood cells & platelets)
Types of Blood CellsCell Function
A Red Blood Cells carry needed materials like oxygen and
glucose
B White Blood Cells fight disease
C Platelets involved in blood clotting
The Heart
Blood flow through the heart: Khan Academy
Or you tube
Crash Course – The heart
Go with the Flow – Heart Diagram
Summary
Heart Video
lungs
body
Veins
(O2 poor)
Pulmonary artery
(O2 poor)
Arteries
(O2 rich)
Pulmonary vein
(O2 rich)
Lab
Lab Instructions
Work in pairs or groups of 3.
Follow the instructions, step by step on the lab pages
If the day is nice, we can go outside!
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