The type of joint that allows movement in one plane, like the elbow and knee, is:
A. Ball and socket
B. Saddle
C. Hinge
D. Pivot
Answer: Option C
Solution (By JKSSB Mock Tests)
Hinge joints (ginglymus) permit flexion and extension only, like a door hinge. The elbow, knee, and interphalangeal joints are examples. Ball-and-socket (hip) multiaxial, pivot (neck) rotation, saddle (thumb) biaxial.
Explanation:
Phenylketonuria (PKU) is an autosomal recessive disorder due to deficiency of phenylalanine hydroxylase, leading to accumulation of phenylalanine, causing mental retardation if untreated. Albinism is tyrosinase deficiency, sickle cell HbS mutation, cystic fibrosis CFTR defect.
Explanation:
The sporozoite is the motile infective stage injected by the female Anopheles mosquito into the human host. It invades liver cells. Gametocytes are the stage taken up by the mosquito, merozoites are released from liver and infect RBCs.
Explanation:
Renin is released by juxtaglomerular cells of the kidney when blood pressure drops. It starts the renin-angiotensin-aldosterone system. Note: rennin (chymosin) is in the stomach for milk digestion.
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