1.1 Flashcards
What are the four features of mass transport systems?
Vessels
Transport medium
Correct speed
Correct direction
What are the four components of blood?
Plasma
Erythrocytes
Leukocytes
Platelets
What are the three functions of blood?
Transport
Homeostasis
Acts a as a buffer
What three things does blood transport?
Food products
Hormones
Excretory products
What type of curve does oxygen dissociation follow?
A sigmoid curve
In the blood clotting mechanism what chemical to damaged tissues originally release?
Serotonin
What is the effect of serotonin?
It causes the smooth muscle around the damaged area to contract
In the blood clotting mechanism what things move to the site of the damaged tissue after contraction?
Platelets
What do platelets release?
Thromboplastin
What is thrombin composed of?
CA2+ ions and prothrombin
In the blood clotting mechanism what is the function of thrombin?
To catalyse fibrinogen into fibrin
What does fibrin form?
A blood clot
What type of animals have single circulation?
Fish
Why is double circulation required for some animals?
They need larger amounts of oxygen
What are the function of arteries?
To carry blood away from the heart
What three tissues are found in blood vessels?
Elastin fibres
Smooth muscle
Collagen fibres
What are the function of veins?
To carry blood back towards the heart
What valves do blood vessels contain within them to prevent the back flow of blood?
Semi lunar valves
A large surface area to volume ratio means what?
That a transport system is not required
