(a(i))[1]
Describe what occurs in the sarcomere after the myosin head releases ADP and inorganic phosphate ($\text{P}_\text{i}$).
(a(ii))[3]
Explain exactly what role ATP plays in the sliding filament model.
(b(i))[1]
Ultrafiltration needs a high blood pressure in the glomerulus. Explain how this high blood pressure is created.
(b(ii))[1]
Name the chief filtration barrier in the nephron that permits creatinine to enter the renal capsule but prevents red blood cells from passing through.
(c)
(c(i))[2]
Describe the pattern shown in Fig. 5.2.
(c(ii))[2]
Use Fig. 5.2 to estimate the creatinine concentration in the blood that shows a normal GFR.
(c(iii))[2]
Suggest two reasons why the GFR might fall.