Download Cardiovascular System - Flipped Out Science with Mrs. Thomas!

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 that 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 multiply
and fight the infection
 White blood cells attack
 Video:
https://www.youtube.com/watch?v=0TvT
yj5FAaQ

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 fists put
together.
 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 Pressure
Blood Vessels
These are the
tubes that carry
your blood
 There are 3 types:
arteries, capillaries
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 Cells
Cell
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 –
follow the instructions to complete the labeling and
then color the oxygenated and deoxygenated blow
flow. Remember the resources on my website!
Summary

Pulmonary
artery
lungs
(O2 poor)
Pulmonary
vein
(O2 rich)
Heart Video
Veins
Arteries
(O2 poor)
(O2 rich)
body