Transcript 30.3 The Heart and Circulation

Set
Cornell Notes
on pg.
29.4upCentral
and Peripheral
Nervous Systems
49
30.3 The
Heart and Circulation
2.1 Atoms,
Ions,
and Molecules
Topic: 30.3 The Heart and
Circulation
•Essential Question(s):
1. On the bottom of pg. 48
please create a doublebubble map comparing
and contrasting
pulmonary and systemic
circulation. Add a
picture to each.
KEY CONCEPT
The heart is a muscular pump
that moves the blood through
two pathways.
30.3 The Heart and Circulation
KEY CONCEPT
The heart is a muscular pump that moves the blood
through two pathways.
30.1 Respiratory and Circulatory Functions
Points to Ponder
• Think about the muscles in your body:
– Do they get tired?
– Hurt?
– Sore?
– Torn?
• Now think about your heart. Does it do these things?
30.1 Respiratory and Circulatory Functions
REVIEW
• The system includes :
– heart pumps blood throughout body
Blood Vessels
– arteries move blood away from heart
- Oxygen-rich blood
– veins move blood back to the heart
- Oxygen-poor blood
– capillaries get blood to and from tissues
- *Where gas, water, and nutrient exchange occur
30.1 Respiratory and Circulatory Functions
• Blood pressure is a measure of the force of blood pushing
against artery walls.
• High blood pressure can precede a heart attack or stroke.
30.3 The Heart and Circulation
The tissues and structures of the heart make it an
efficient pump.
• Cardiac muscle tissue works continuously without tiring.
NORMAL HUMAN HEART
30.3 The Heart and Circulation
• The heart has four chambers: two atria, two ventricles.
• Valves in each chamber prevent backflow of blood.
• Muscles squeeze the chambers in a powerful pumping
action.
pulmonary valve
aortic valve
left atrium
right atrium
mitral valve
left ventricle
tricuspid
right ventricle
septum
30.3 The Heart and Circulation
• The heartbeat consists of two contractions.
1) Sinoatrial (SA) node, or pacemaker,
stimulates atria to contract
LUB
2) Atrioventricular (AV) node stimulates
ventricles to contract
DUB
Lub-dub
Lub-dub
Lub-dub
SA node
VA node
30.3 The Heart and Circulation
Heartbeat contractions
30.3 The Heart and Circulation
• Blood flows through the heart in a specific pathway.
1. oxygen-poor blood enters
right atrium from the body
2. Blood pumps into the right
ventricle, which pumps
blood to lungs to pick up O²
3
3. oxygen-rich blood from 1
lungs enters left atrium
4. Blood pumps into the left
ventricle, which pumps
blood to the body
4
2
30.3 The Heart and Circulation
Oxygen-poor
blood
Aorta
Oxygen-rich
Right Atrium
blood
Left Atrium
Left Ventricle
Right Ventricle
To the body
30.3 The Heart and Circulation
30.3 The Heart and Circulation
30.3 The Heart and Circulation
Two main pathways of blood
Pulmonary circulation
Systemic circulation
30.3 The Heart and Circulation
The heart pumps blood through two main pathways.
• Pulmonary circulation occurs between the heart and the
lungs.
– oxygen-poor blood enters lungs
- excess carbon dioxide and water
expelled (exhale)
– blood picks up oxygen (inhale)
- oxygen-rich blood returns to heart
30.3 The Heart and Circulation
• Systemic circulation occurs
between the heart and the
rest of the body.
– oxygen-rich blood goes to
organs, extremities
(arms/legs)
– oxygen-poor blood returns to
heart
30.3 The Heart and Circulation
• The two pathways help maintain a
stable body temperature.
30.3 The Heart and Circulation
Divide the top of pg. 48 Into 4 equal sections
Intro to Circulatory System
1m20s
Circulatory System
1m56s
How the Circulatory System Works
Slim Goodbody  3m
Blood Circulation
2m48s
5 bullets each video
30.1 Respiratory and Circulatory Functions
Lifestyle plays a key role in circulatory diseases.
• Some choices lead to an increased risk of circulatory
diseases.
– smoking
– long-term stress
– excessive weight
– lack of exercise
– diet low in fruits
and vegetables,
high in saturated
fats
30.1 Respiratory and Circulatory Functions
• Circulatory diseases affect mainly the heart and the
arteries.
– artery walls become thick and inflexible
– plaque blocks blood flow in arteries
Plaque
Artery wall
30.3 The Heart and Circulation
Regular heart vs. Enlarged Heart
30.3 The Heart and Circulation
Review: Use your Notes from Friday to help you
• Name the four chambers of the heart
• Explain the path of the oxygen-poor
blood
• Explain the path of the oxygen-rich
blood
• When the oxygen-poor blood enters
the lungs what does it drop off and pick
up?
30.3 The Heart and Circulation
• Name the four chambers of the heart
• Right atrium, right ventricle, left atrium, left
ventricle
• Explain the path of the oxygen-poor blood
• Enters the right atrium from the body, to right
ventricle, to the lungs
• Explain the path of the oxygen-rich blood
• Enters from the lungs into the left atrium, to the
left ventricle, and out to the body through the
aorta
• When the oxygen-poor blood enters the lungs what does it
drop off and pick up?
• Drops off carbon dioxide and water vapor and
picks up oxygen
30.3 The Heart and Circulation
Crash Course: Respiratory and Circulatory System (12m)
http://www.youtube.com/watch?v=9fxm85Fy4sQ
30.3 The Heart and Circulation
Aorta
Left
Atrium
Right
Atrium
Right
Ventricle
L.
Ventricle
30.3 The Heart and Circulation
From the body
To lungs
To lungs
From the body
30.3 The Heart and Circulation
To the body
From lungs
From lungs
To the body
30.3 The Heart and Circulation
From the body
To the body
To lungs
To lungs
From lungs
From lungs
From the body
To the body