functions of the circulatory system
- 1) transport gases, nutrients, and waste materials
- 2) Regulation of internal body temp and transport hormones
- 3) Protects against blood loss and toxic substances introduced into the body
- Arteries: Carries oxygen-rich blood away from the heart
- Veins: carry oxygen-poor blood towards the heart
- Capillaries: tiny vessels separating arteries and veins where gases, nutrients, and other materials are transferred to cells
- Keeps oxygen-rich blood away from the heart
- - Has thick and highly elastic walls
- - expands as the blood flows through the constriction and relaxation of ventricles.
- - Keeps the blood flowing in the right dirrection
- Carries oxygen-poor blood towards the heart
- - has thin and non-elastic walls
- - cannot contract to help move blood back to the heart
- -has valves that prevents blood from flowing backwards
- A small blood vessel that is just large enough for the largest blood cell to fit through.
- - They play a key role in the absorption, transport, and release of nutrients, gases, and wastes produced in the body.
decreases the blood flow near the skin to conserve heat
Increases blood flow near the skin to help release heat
Functions of the heart
- 1) Pumo blood throughout the body
- 2) ensure blood flow only moves in one direction
- 3) Separate oxygen-rich blood from oxygen-poor blood
Atrium: top two chambers that fill with the blood returning to the heart
Ventricles: bottom two chambers that receive blood from the atria and pump it away from the heart
Septum: thick muscular wall that separates the right from left
Tricuspid: On the right side separating the right atrium and right ventricle
Bicuspid: On the left side separating the left atrium and left ventricle
Pulmonary: Separating the right ventricle
Aortic: separating the left ventricle from the aorta
Where oxygen-poor blood enters into the right atrium
- Superior: top half
- Inferior: bottom half
where the left ventricle pumps blood though to get all the body tissue
Transports oxygen-poor blood to the alveoli in the lungs
Transport oxygen-rich blood to deliver nutrients and remove wastes from cells throughout the body
Sequence of travel of the heartbeat
1)SA Node: The pacemaker of the heart - stimulates the muscles to contract and relax rhythmically
2)AV Node: They relay the signal from the SA node to the Purkinje fibres through the bundle of his
3)Bundle of His: Relayyyy
4)Purkinje fibres: Initiates the contractions of the left and right ventricles
Systolic: Maximum blood pressure during ventricular contraction. Increases the pressure in the pulmonary arteries and aorta.
Diastolic: the lowest pressure before the ventricles contract again. Drops the pressure
Components of blood
- Fluid Portion: Plasma
- Solid Portion: Formed portion
Where red blood cells, white blood cells, and platelets are suspended
Red Blood Cells
- Specialized for ozygen transport and allows large quantities of oxygen to be transported in the blood due to hemoglobin binding with oxygen.
Produced in the bone marrow.
White blood cells
Part of the body's responce to infection.
- Fragments of cells that form when large cells in the bone marrow break apart.
- Play a key role in lood clotting to prevent excessive blood loss after injury.
A, B, AB, and O
Can be rh- or rh+
the differences between them are the antigens
The clumping of red blood cells that can block circulation
The RH factor
Rh- can donate to rh+ but rh+ cannot donate to rh-
- - Made up of interstitial fluid
- - colourless
- - composition similar to plasma
- - WBC highway
- - vessels of lymphatic system and eventually rejoins the circulatory system