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!