29.4 central and peripheral nervous systems set up cornell notes on pg. 49 topic: 30.3 the heart and...
TRANSCRIPT
29.4 Central and Peripheral Nervous Systems Set up Cornell Notes on pg. 49
Topic: 30.3 The Heart and Circulation
•Essential Question(s):
1.On the bottom of pg. 48 please create a double-bubble map comparing and contrasting pulmonary and systemic circulation. Add a picture to each.
2.1 Atoms, Ions, and Molecules
30.3 The Heart and Circulation
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
– 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
Blood Vessels
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.
aortic valve
left atrium
mitral valve
left ventricle
septum
pulmonary valve
right atrium
tricuspid
right ventricle
30.3 The Heart and Circulation
1) Sinoatrial (SA) node, or pacemaker, stimulates atria to contract LUB
2) Atrioventricular (AV) node stimulates ventricles to contract DUB
SA node
VA node
• The heartbeat consists of two contractions.
Lub-dub
Lub-dub
Lub-dub
30.3 The Heart and Circulation
Heartbeat contractions
30.3 The Heart and Circulation
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. oxygen-rich blood from lungs enters left atrium
4. Blood pumps into the left ventricle, which pumps blood to the body
• Blood flows through the heart in a specific pathway.
1
2
3
4
30.3 The Heart and Circulation
Aorta
Right AtriumLeft Atrium
Right Ventricle
Left Ventricle
Oxygen-poor blood
Oxygen-rich blood
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 System1m20s
How the Circulatory System WorksSlim Goodbody 3m
Circulatory System1m56s
Blood Circulation2m48s
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 saturatedfats
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
http://www.youtube.com/watch?v=9fxm85Fy4sQ
Crash Course: Respiratory and Circulatory System (12m)
30.3 The Heart and Circulation
Right Atrium
Left Atrium
Right Ventricle
L. Ventricle
Aorta
30.3 The Heart and Circulation
From the body
From the body
To lungs To lungs
30.3 The Heart and Circulation
To the body
To the body
From lungs From lungs
30.3 The Heart and Circulation
From the body
From the body
To the body
To the body
From lungsFrom lungs
To lungsTo lungs