Transcript Circulation/Blood/Lymphatic Systems

Circulatory System
Blood
Lymphatic System
The Heart & Blood flow
Superior Aorta
Vena Cava
Pulmonary
Pulmonary
Arteries
Veins
Left Atrium
Semilunar
Semilunar
Valve
Valve
Bicuspid
Right Atrium
Valve
Tricuspid
Valve
Left Ventricle
Inferior VenaRight
Cava Ventricle
Septum
To
Body
From Body
To Lungs
From
Lungs
To Lungs
From
Lungs
From Body
To Body
Contraction
of Atria
Section 37-1
1) Sinoatrial
(SA) node
Contraction
of Ventricles
Conducting
fibers
The
2) Atrioventricular
(AV) node
Pacemaker
System
Circuit
Pulmonary
Circuit
Circulatory System
• Pulmonary
Circulation
–Carries blood between
the heart and the
lungs only
• Systemic Circulation
–Carries blood between
the heart and the rest
of the body, except for
the lungs
Artery
Capillary
Arteriole
Venule
Vein
Blood Vessels
• Arteries: carry O2- & nutrient-rich
blood away from the heart to body
(arterials-small arteries)
• Veins: carry CO2- & waste rich blood
back from body towards the heart
(venules-small veins)
• Capillaries: where nutrients, gases, &
wastes are exchanged with the body;
located b/w arteries & veins
Artery
Capillary
Vein
Valve
Smooth
Muscle
Connective
Tissue
Epithelium
Blood’s Role
• Transports raw materials (from
digestion) to the cells
• Removes waste from cells
–Brings wastes to kidneys, lungs, & skin
• Maintains a fluid environment for the
cells
• Protects the body from disease
• Keeps body pH stable
• Prevents further blood loss
Blood Composition
Blood Composition
• Erythrocytes: RBC’s; carry
Oxygen/Carbon Dioxide using hemoglobin
(~45% of blood) (circulate up to 120 days)
• Leucocytes: WBC’s; body defense (<1%
of blood) (circulate under 1 day)
• Platelets: involved in clotting (<1% of
blood) (circulate 3-8 days)
• Plasma: liquid where gases/nutrients are
dissolved (~55% of blood)
Section 37-2
Plasma
Platelets
WBC’s
RBC’s
Lymphatic System
• All of our cells are bathed by fluids
that diffuse out of the capillaries
• This system collects these fluids and
proteins and returns them to the blood
• Lymph nodes return fluids & proteins
to the blood, plus have WBC’s to help
protect the body from disease or
cancer-causing cells
Lymphatic System
Circulatory System