Soc 15 : The Structure of the Heart Flashcards
Cardio -repirartory sytem
The I interaction of the heart and lungs to supply oxygen to muscles during exercise.
Cardiovascular
To do with the heart, blood and blood wessels logether
Vasodilation
When veins swell up or dilate, widening of the / internal diameter (lumen) of the blood vessel to allow increased blood flow.
Vasoconstriction
When veins shrink down; narrowing of the internal diameter (lumen) of the blood vessel to decrease blood flow.
What are the three functions of the
cardiovascular system?
Transports oxygen ,carbon dioxide and nutrients .
It helps clot blood .
It controls the body tempurature.
Arterties
Arteries take blood away from the heart
Veins
Veins carry blood into the heart
Veins have much thinner walls, are less elastic and carry blood at a lower
pressure
Cappilaries
Capillaries are microscopic vessels - just one cell thick
How does the heart pump blood?
The heart beats in a ‘lub dub’ rhythm
Blood pressure
Blood pressure is a measure of the force that your heart uses to pump the blood around your body
What is the importance of red blood cells
Red blood cells transport oxygen from the lungs to the body’s cells, and carbon dioxide from the cells to the lungs
What is the importance of white blood cells
The blood also contains transparent cells called white blood cells
What is the importance of platelets
Blood platelets are formed in the bone marrow
What is the importance of plasma
The main role of plasma is to take nutrients, hormones, and proteins to the parts of the body that need it
Vascular shunting
process that
increases blood flow to active
areas during exercise by diverting
blood away from inactive areas;
achieved by vasodilation and
vasoconstriction.
