Flashcards in The Heart and Blood Deck (22):
4 components of blood
plasma, erythrocytes, leucocytes
Function of plasma
transports heat and dissolved substances eg. vitamins, CO2, hormones, minerals
Function of red blood cells
Function of lymphocytes
Function of Monocytes/ Macrophages
scavenge and digest bacteria.
Function of phagocytes
engulf bacteria after surrounding them and digest them.
Function of thrombocytes
-high pressure blood
-oxygenated except pulmonary artery
-flows in pulses
-dexygenated blood except in pulmonary vein
-doesn't flow in pulses
-blood is at lower pressure.
the force the blood exerts against the walls of the blood vessel. mmHg
the alternating expansion and contraction of the arteries.
Where is the heart?`
between the two lungs, slightly to the left of your thorax, above the diaphragm.
What holds bicuspid valves in position?
Function of semilunar valves
allows blood flow out of the heart through pulmonary artery/ aorta and prevents blood from going back into the heart.
Function of pericardial fluid
helps reduce friction .
thin walls as blood only needs to go a short distance.
thicker wall as they pump blood for longer and for a further distance.
Benefits of double circulation
-oxygen rich blood and oxygen poor blood are separate
-ensures b.p. is high enough to get blood everywhere
(single circuit can only have blood at low pressure. This restricts the metabolism of the animal)
-right ventricle pumps blood around here
-blood gains O2 and loses CO2 at lungs.
-short circuit, walls are thin
-Left ventricle pumps blood to head/ shoulders/ legs etc.
-lose O2 and gain CO2
-longer route, thicker walls.
What is a portal system?
blood pathway that begins and ends in capillaries.