Human Biology - Circulation And Digestion Flashcards
What is meant by a ‘double circulation’?
The heart is two pumps attached together, one pump (right) pumps blood to the lungs, the other pump (left) pumps blood to the rest of the body.
What is the function of the valve a in the heart?
They prevent blood from flowing on the wrong direction
In which chamber of the heart is the natural pacemaker found?
Right atrium
Why are stents used?
To open up blood vessels which have been narrowed by fatty deposits
What does the pulse rate correspond to?
The heart rate/heart beats
What is the function of platelets?
They help the blood to clot at the site of a wound
What type of drug reduces the risk of rejection of a donor organ?
Immunosuppressant drugs
How is the small intestine adapted for efficient absorption of soluble molecules?
The villi have a large surface area, are well supplied with blood capillaries, have thin walls
Which enzyme digests protein?
Protease
Why are fats emulsified?
To increase the surface area of the fat droplets so lipase can digest them quicker
