quiz 4 Flashcards
In terms of heart structure, what is the function of a valve?
To the prevent the backflow of blood
Why dont veins need thick muscle walls and elastic tissue?
They dont need to withstand high blood pressure
Which chambers contract to pump blood to the body and lungs?
The ventricles
Give one advantage of using mechanical valves
They last for a long period of time and therefore do not replacing often
What is the name of the heart muscle?
cardiac muscle
What is an artifical peacemaker?
Electrical devices used to control the rate of the heartbeat
Which type of blood vessels carry blood at high pressure?
arteries
What is the function of red blood cells?
To carry oxygen around the body
Describe the structure of an artery
Thick muscle walls, thick layers of elastic tissue and narrow lumen
Which type of blood vessels carry blood at low pressure?
Veins
What is a mechanical valve?
valves made of metal or carbon that open and shut with each heartbeat
What is a lumen?
The hollow space inside blood vessels
Name the blood vessel that brings oxyegnated blood to the heart
Pulmonary vein
Give one disadvantage of using statins to treat coronary heart disease(CHD)
Statins are a pill which someone may forget to take
Give one reason a red blood cell has no nucleus
Leaves space for the haemoglobin
What is a heart transplant?
surgery to replace a damaged heart with a healthy donor heart
Give on disadvantage of using stents to treat coronary heart disease(CHD)
stents can cause blood clots. so patents must remember to take anti-clotting medicine
Where does glucose which is dissolved in the blood come from?
it is absorbed into the bloodstream by the small intestine
Why is the blood an example of a tissue?
it is a group of similar cells working together to perform a similar function
What is the function of platelets?
help clot the blood at wound sites
