Edexcel A Level Biology Topic 1
Questions with solutions 2024
update
How are capillaries adapted to their function? - Answer
permeable walls 1 cell thick, close to every cell
What are the 3 stages of the cardiac cycle? - Answer atrial
systole, ventricular systole, diastole
Features of atrial systole - Answer -Atria contract, ventricles
relax
-Atrioventricular valves open
-Blood pushed into ventricles
, Features of ventricular systole - Answer -Ventricles contract ,
atria relax
-Semilunar valves open
-Blood pushed into aorta and pulmonary artery
Features of cardiac diastole - Answer -Atria and ventricles
relaxed
-Blood returns to heart
-Atria and ventricles fill
features of the heart - Answer -Four chambered, sends blood
to the upper and lower body.
-double pump
Atherosclerosis - Answer 1- Endothelium damaged or
dysfunctional
2-Inflammatory response
3-Calcium salts and fibrous tissues harden, forming plaque
4-Increased blood pressure, positive feedback
Questions with solutions 2024
update
How are capillaries adapted to their function? - Answer
permeable walls 1 cell thick, close to every cell
What are the 3 stages of the cardiac cycle? - Answer atrial
systole, ventricular systole, diastole
Features of atrial systole - Answer -Atria contract, ventricles
relax
-Atrioventricular valves open
-Blood pushed into ventricles
, Features of ventricular systole - Answer -Ventricles contract ,
atria relax
-Semilunar valves open
-Blood pushed into aorta and pulmonary artery
Features of cardiac diastole - Answer -Atria and ventricles
relaxed
-Blood returns to heart
-Atria and ventricles fill
features of the heart - Answer -Four chambered, sends blood
to the upper and lower body.
-double pump
Atherosclerosis - Answer 1- Endothelium damaged or
dysfunctional
2-Inflammatory response
3-Calcium salts and fibrous tissues harden, forming plaque
4-Increased blood pressure, positive feedback
