Studied by 0 people
plasma components
substances carried within plasma
red blood cells
carry oxygen
white blood cells
fight disease
phagocytes
engulf pathogens
lymphocytes
produce antibodies that stick to antigens on pathogens to destroy them
structure of red blood cells
biconcave shape - large surface area for diffusion of oxygen
no nucleus - more space for haemoglobin to carry oxygen
adaptations of capillaries for gas exchange
permeable walls for diffusion
walls are on cell thick so short diffusion distance
blood flow in the right side of the heart
blood from body → vena cava → right atrium → tricuspid valve → right ventricle → semi lunar valve → pulmonary artery → lungs
blood flow in the left side of the heart
blood from lungs → pulmonary artery → left atrium → bicuspid valve → left ventricle → semi lunar valve → aorta → body
coronary heart disease
coronary arteries become blocked with plaque causing a lack of oxygen then a heart attack
risk factors of coronary heart disease
diet high in saturated fat
high blood pressure
inactivity
smoking
role of kidney
removal of urea and adjustment of ion and water levels
Note
Flashcard