Download Circulatory System

Circulatory System
PARTS
PAGE 487 - 496
Parts of the Circulatory System
 Heart:
 Blood
vessels:
 Arteries:
 Veins:
 Capillaries:
Parts of the Circulatory System
 Two-circuit
 Blood
system:
goes to:
 Lungs:
 Body
cells:
Parts of the Circulatory System
 More
than a two-circuit
system?
 Blood
also goes to:
 Digestive
 Liver:
 Kidney:
system:
Blood vessels
Circulatory System: Arteries
 Carry
blood away from heart
 Blood
 Aorta:
 Splits
can be oxygen-rich or oxygen-poor
largest artery that leaves the heart
into the ascending and descending
branches
Circulatory System: Arteries
 Structure:
3
layers:
 1.
 2.
 3.
 Why
is it designed to be
slightly elastic?
Circulatory System: Arteries
 Arterioles:
smallest artery
that still contains smooth
muscle
Circulatory System: Arteries
 Arterioles:
smooth muscle under control of nervous system
 Vasoconstriction:
 Vasodilation:
 Used
to regulate body temperature by controlling blood flow to
the skin
Circulatory system: Capillaries
 Very
small vessels that branch out from
arterioles
 Forms
an extensive network that moves
through all body tissues
 At
their smallest, only one blood cell is
able to move through at a time
Circulatory system: Capillaries
Circulatory system: Capillaries
 Blood
flow slows in the capillaries
 The
extensive branching increases the area
the blood must flow through
 Slowed blood gives it more time to exchange
materials with cells
 Blood
flow can also be controlled by small
sphincter muscles located at beginning of
capillaries
Circulatory system: Veins
 After
blood passes capillaries it moves
through venules before entering the veins
 Deoxygenated
 How
and carrying waste products
is it similar and different
from the artery
Circulatory system: Veins
 Blood
 How
pressure much lower in veins
does blood get back to the heart?
 Valves?
Circulatory system: Veins
Blood pressure
 The
pressure exerted on the blood to
move through the body by the
contractions of the heart
 Systolic
pressure:
 Diastolic
pressure:
Blood pressure
Homework: For THURSDAY
 Read
pages 495-497
 Draw
a diagram of the heart with:
 Chambers
 Valves
 Entering
 Create
and exiting vessels
a flow chart detailing the flow of
blood as it moves through the heart, lungs,
and body