the human body chapter 33 circulatory and respiratory systems
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The HUMAN BODY
Chapter 33
Circulatory and Respiratory Systems
Chapter 33.1 Circulatory System
• Objectives– Identify the function of the
circulatory system– Describe structure of heart and
explain how it pumps blood through the body
– Name three types of blood vessels in the circulatory system
CIRCULATORY SYSTEM
• Function:– Using blood and blood vessels,
this system delivers nutrients and oxygen for body cells and carries away Carbon Dioxide and other wastes
Components of system• Heart
– 4 chambers:• 2 atria (upper)- receives blood• 2 ventricles (lower)- pumps
blood -Separated by atrioventricular
(A-V) valves-Right and Left sides separated
by the septum
Components cont’d
• Blood Vessels– Veins- carry blood to the heart (some have valves)
– Arteries- carry blood away from the heart
– Capillaries- small vessels that connect veins/arteries
*(where nutrients/wastes pass in/out of blood stream)
Blood Vessels
Paths of Circulation
• Pulmonary Circulation– Right Atrium
– Right Ventricle
– Lungs (picks up O2 and drops off CO2)
– Left Atrium
Paths of Circulation
• Systemic Circulation– Left Atrium
– Left Ventricle
– Aorta
– Body (drops off O2 and picks up CO2)
– Right Atrium
Blood Pressure
• Force exerted on blood vessels walls by blood– Normal: below 120/80– Too high stroke or heart
attack
Check-in• Heart chambers that receives blood
– Atria
• Heart chambers that pumps blood– Ventricles
• Right and left sides of heart separated by– Septum
• Atria and ventricles separated by– Atrioventricular (A-V) valves
Check-in• Type of vessel where nutrients pass in/out
– Capillaries
• Type of vessel that carries blood to heart– Vein
• Vessel that carries blood away from heart– Artery
• Pressure that blood exerts on vessel walls– Blood pressure
Check-in• Describe pulmonary circulation
– R heart to lungs to L heart
• Describe systemic circulation– L heart to body to R heart
• Which side of the heart has oxygenated blood?– Left side
Chapter 33.2 Blood and Lymphatic System
• Objectives– Explain functions of blood
plasma, red blood cells, white blood cells, and platelets
– Describe the role of the lymphatic system
Blood Components
• Blood has 4 components:
• Plasma- liquid portion
• Red Blood Cells (RBC)- carries oxygen to cells using hemoglobin
• White Blood Cells (WBC)- defend body against germs
• Platelets- cell fragments used to clot blood
What blood component?
• Carries nutrients
• Fights infections
• Clots blood
• Carries oxygen
• Contains hemoglobin
• Is the liquid portion
• Makes up most of the cells of blood
PlasmaWBCPlatelets
RBCRBC
Plasma
RBC
Lymphatic System connection
• Lymph (fluid) moves through a network of vessels, nodes, and organs in order to…– collect fluid lost by blood– help in nutrient absorption– aid in immune response
Elephantaisis (Filarial lymphodema)Caused by parasitic worms damaging tissue- lymph fluid builds up in the tissues
Chapter 33.3 Respiratory System
• Objectives– Identify the structures of the
respiratory system and describe their functions
– Describe gas exchange– Describe how breathing is controlled– Describe the effects of smoking on
the respiratory system
RESPIRATORY SYSTEM
• Function: – Bring Oxygen into the body
– Remove Carbon Dioxide and Water
Pathway of Air
• Nose- warms, moistens air
• Throat (pharynx)
• Larynx- produces sound, contains vocal cords
• Trachea- aka windpipe, carries air from throat to chest
Pathway of Air cont’d
• Bronchi- tubes that carry air into lungs
• Bronchioles- smaller branching tubes
• Alveoli- tiny air sacs in lungs where gases exchange
Connection with Circulatory System
• Air enters alveoli• Alveoli covered with
capillaries• Oxygen diffuses into
blood and binds with hemoglobin
• Carbon Dioxide, etc. diffuses out of blood
How Breathing Works
• The DIAPHRAGM contracts and pulls down
• Chest/Rib muscles pull up at same time
• Chest expands
• Air pressure decreases air goes in
Lung Capacity
• Tidal volume: volume of air a person breathes in/out in normal relaxed breathing
• Vital capacity: maximum volume a person can breathe out after breathing in fully
Health Hazard: Smoking!
• Tobacco: Scientific Discoveries
• Look for:– What three dangerous chemicals are in
cigarettes?
– What diseases are caused by smoking?
Smoking is Sexy!
Check-in
• Another name for throat:– Pharynx
• Another name for voice box:– Larynx
• Another name for windpipe:– Trachea
Check-in
• Flap of tissue that covers trachea to prevent choking when you swallow:– Epiglottis
• What is the path of oxygen from air to alveoli?– Nose pharynx larynx trachea
bronchi bronchioles alveoli
Check-in
• What two muscles are involved in breathing?– Diaphragm and rib cage muscles
• What protein in RBC binds with oxygen?– Hemoglobin
• What three dangerous substances does smoking bring into the body?– Nicotine, tar, and carbon monoxide
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