Circulatory System - Ms. Emery's AP Biology

Circulatory System
Created by: Angelica Parker and Mikaela
The system's job
• The circulatory system, also called the
cardiovascular system, permits blood to
circulate and transport nutrients, oxygen,
carbon dioxide, etc. to nourish and help
fight off diseases.
• Helps stabilize body temperature and pH
• The circulatory system is composed of:
1. Blood to carry the minerals necessary
2. A pump to push blood through the body
3. Lungs to oxygenate the blood (systemic
4. Brain (dual blood supply)
5. Kidneys
6. Lymphatic System
• Blood is a body fluid that transports
essential elements in the body.
• The two most important functions are the
transport of things to the tissues, and the
removal of wastes from the tissues.
• Transports oxygen to all the tissues of the
• Hormones, nutrients like vitamins and
minerals are also transported through the
The Heart
• Organ that pumps blood throughout the
body by electrical pulses that cause
muscle contractions that squeeze the
blood out (systole), and fill the chambers
with blood to be sent to the lungs for
oxygenation (diastole).
• Each minute your heart pumps 1.5 gallons
of blood.
• Lungs transport oxygen from the
atmosphere to the bloodstream and
release carbon dioxide from the
bloodstream into the atmosphere.
• Deoxygenated blood through pulmonary
artery to lungs. Oxygenated by air-filled
sacs (alveoli), blood returns to heart
through pulmonary veins.
The Brain
• Dual blood supply
-Anterior circulation comes from the
internal carotid arteries, supplies front of the
-Posterior circulation comes from the
vertebral arteries, supplies the back of the
brain and brainstem
• circulation from the front and the back join
together (anastomise) at the Circle of
• renal circulation receives ~20% of cardiac
• branches from the lower aorta and returns
blood to the ascending vena cava
Lymphatic System
• Part of circulatory system
• Made up of a network of lymphatic vessels
and lymph capillaries, lymph nodes,
organs, lymphatic tissues and circulating
• Carries lymph, draining and returning
interstitial fluid back towards the heart for
return to the cardiovascular system, by
emptying into the lymphatic ducts
Diagram of
Types of circulatory systems
• Open circulatory system- The heart pumps
fluids through the organism but there is no
complete system of vessels. This is
commonly found in molluscs and
• Closed circulatory system- The heart is
connected to a complete system of
vessels. This is found in more advanced
organisms such as humans.

similar documents