Download the circulatory system

Circulatory System
Recall:
Cellular respiration: the process of a cell converting
glucose into energy.
Oxygen is an important reactant required for this
process:
C6H12O6 + O2
 CO2 + H2O + energy
Circulatory System:
MAIN FUNCTIONS
1. Transport substances around the body
a. oxygen (needed for cellular respiration) and
carbon dioxide
b. nutrients (e.g. from intestines) and wastes
(e.g. to kidneys)
c. hormones
d. infection-fighting white blood cells and
chemicals from immune system
2. Regulate body temperature
COMPONENTS: 1. Heart
2. Blood vessels
3. Blood
1. Heart :  made up of cardiac muscle, nerve, and
connective tissues
pumps blood through the body
tissues and inner surface covered by
epithelial tissues to protect heart from
damage and allow blood to flow freely.
2. Blood has 2 main components
a. Plasma (55%)
b. Blood cells (45%)
– red (transport oxygen) – more 43%
- white (infection-fighting) – 1%
- platelets (help in blood clotting) – 1%
3. Blood Vessels:
a. Arteries: carry blood away from heart.
Have thick walls
b. Veins: carry blood towards the heart. Walls
are not as thick.
c. Capillaries: link arteries and veins together
 tiny blood vessels. Very thin
walls allow substances to diffuse
between the blood and other body
fluids and tissues.
Overall:
oxygen diffuses through capillaries from the lung
into the bloodstream
heart pumps oxygenated blood through arteries into
the capillaries where the oxygen (and other important
substances) diffuse through the capillaries to the
surrounding tissues.
 blood then absorbs carbon dioxide and other
substances through the capillaries and travel back to
the heart and eventually diffuses back into the lungs
which then realease it into the air.
Heart Diseases:
Coronary artery diseases: artery can become
blocked by deposits of fat, cholesterol, etc
Blood (with oxygen) cannot get to heart muscle –
heart can stop pumping (heart attack)
Cause can be genetic or poor diet, exercise, or
habits
COMPONENTS:
1. Heart : discuss later
2. Blood has 2 main components
c. Plasma (55%)
d. Blood cells (45%)
– red (transport oxygen) – more 43%
- white (infection-fighting) – 1%
- platelets (help in blood clotting) – 1%
3. Blood Vessels:
a. Arteries: carry blood away from heart.
Have thick walls
b. Veins: carry blood towards the heart. Walls
are not as thick.
c. Capillaries: link arteries and veins together
 tiny blood vessels. Very thin
walls allow substances to diffuse
between the blood and other body
fluids and tissues.
Overall:
oxygen diffuses through capillaries from the lung
into the bloodstream
heart pumps oxygenated blood through arteries into
the capillaries where the oxygen (and other important
substances) diffuse through the capillaries to the
surrounding tissues.
 blood then absorbs carbon dioxide and other
substances through the capillaries and travels back to
the heart through veins and which pumps it to
capillaries in lungs and CO2 diffuses back into the
lungs which then release it into the air.
The Mammalian Heart
 Heart consists of 2 parallel pumps separated by a
septum
 Left atrium and right atrium contract and send blood to
ventricles
 Left and right ventricles contract and send blood to
lungs and body

Left side receives oxygenated blood from lungs and
pumps it to cells of body
 Right side receives deoxygenated blood and pumps it to
lungs

Valves prevent back flow into the heart when it pumps
The Circulatory System
(Section 3.4)
1. State what other systems the circulatory system interacts with when it
transports
a) oxygen and carbon dioxideb) waste substances2. Blood is considered a _______________________ tissue.
3. Why are the walls of arteries thicker than veins?
4. Why do the walls of the capillaries need to be very thin?
Heart
5. Heart tissue is made up of all 4 tissue types.
a) What is unique about cardiac muscle?
b) What are 3 purposes of the epithelial tissue in the heart?
Coronary Artery Disease
6.
a) What happens to the blood vessels in this disease
b) What factors affect plaque build-up?
c) What are the symptoms of this disease?
d) How can it be diagnosed?
e) What is a heart attack?
Other:
7. Answer pg. 87 #1-9
The Mammalian Heart
 Heart consists of 2 parallel pumps separated by a
septum
 Left atrium and right atrium contract and send blood to
ventricles
 Left and right ventricles contract and send blood to
lungs and body

Left side receives oxygenated blood from lungs and
pumps it to cells of body
 Right side receives deoxygenated blood and pumps it to
lungs

Valves prevent back flow into the heart when it pumps
Overheads: digestive track, circulatory diagrams and notes
Heart?
Photocopy: circulatory handout + diagrams
SNC2D:
-take up homework on digestive system (5 min)
-make note on digestive system (10 min)
-have them copy the table on pg. 76 down
-when done have them do – diffusion activity
- tissue exercise
– talk about diffusion
-talk about cellular respiration?
- videos on mitosis/cancer?
Wed: circulatory system
Thurs: videos on mitosis/cancer
Finish heart?
SNC2DG:
Take up homework
Have them read 3.4 and do handout
Take notes + discuss diagrams
Maybe video?
Wed: video?
Talk about the heart?
Start respiratory system?