Pre-class Activity 1/18
How does blood help the body
maintain homeostasis?
The Cardiovascular system
Carries nutrients, oxygen, hormones, and
wastes through the body and distributes
heat to maintain homeostasis
Components
Heart
Blood Vessels
Blood
Pre-class Question 1/5
What are the three components of
the cardiovascular system?
Heart
Blood vessels
Blood
Blood Vessels
Arteries
Arterioles
Contains a muscular
layer that allows the
vessel to expand
when blood passes
through
Capillaries
Venules
Allows for the
exchange of
materials
between the
blood and fluid
surrounding
cells. Capillaries
are only one cell
thick.
Veins
Returns
blood to
the heart.
Valves stop
blood from
flowing
backward.
Vascular System
Blood
Liquid
Plasma (55%)
•90% Water
•10% Solutes
•Salts
•Proteins
Solid
Cells
•Red blood
cells
•White blood
cells
•Nutrients
•Wastes
Platelets
Pre-class Question 1/6
What feature of arteries make them pump
blood efficiently?
Homework
Active Reading Worksheet: Cardiovascular system
(due 1/7)
Blood Cells and Platelets
Red Blood Cells
Responsible for transporting oxygen that is
bound to hemoglobin.
Mature red blood cells do not have nuclei and
live only about 120 days.
White Blood Cells
Contain nuclei and defend the
body against disease.
Platelets
Cell fragments that aid in
blood clotting
Blood Types
Blood Type is determined by antigens
(proteins) on the surface of red blood cells.
The major blood types are A, B, O and Rh
Cardiovascular Health
4 Main Diseases
High Blood Pressure (Hypertension)
Blood pressure over 120/80
Hardened Arteries (Arteriosclerosis)
Accumulation of plaque on the walls of arteries narrows
arteries and decreases the flow of blood
Heart Attack
Occurs when blood supply to the heart is reduced or stopped.
Stroke
Occurs when blood supply to the brain is blocked or
when a blood vessel in the brain bursts.
Lymphatic System
Key components
Lymph vessels
Lymph nodes
Lymph tissue
Some fluid leaks out of capillaries as blood passes
through. This fluid is collected by the lymphatic system
and delivered back to the blood stream. The lymphatic
system is also responsible for fighting infection.