Draw a neat, labelled diagram of Malpighian capsule.
Topic: Malpighian capsule — diagram
Answer
Your diagram must show: • BOWMAN’S CAPSULE — a double-walled cup • GLOMERULUS — the knot of blood capillaries inside the cup • AFFERENT ARTERIOLE — entering, drawn WIDER • EFFERENT ARTERIOLE — leaving, drawn NARROWER • PROXIMAL CONVOLUTED TUBULE leading away from the capsule
Labels required: Bowman’s capsule, glomerulus, afferent arteriole, efferent arteriole, proximal convoluted tubule.
The MALPIGHIAN CAPSULE is Bowman’s capsule together with the glomerulus inside it — so the diagram must show BOTH, not just the cup.
THE DETAIL THAT EARNS MARKS: draw the AFFERENT arteriole noticeably WIDER than the EFFERENT one. That difference is not decoration — blood enters faster than it can leave, so pressure builds inside the glomerulus, and that pressure is what drives ULTRAFILTRATION. A diagram showing the two vessels equal misses the whole mechanism.
WHAT HAPPENS HERE: water, glucose, amino acids, urea and salts are forced out of the glomerulus into the capsule, while blood cells and large plasma PROTEINS are held back — which is why protein in the urine signals a damaged filter.
Draw large and in pencil, with labels outside on straight lines.