The blood cells that initiate blood clotting are: MCQ with Answer and Explanation

The blood cells that initiate blood clotting are:
A. Leukocytes
B. Erythrocytes
C. Lymphocytes
D. Thrombocytes (platelets)
Answer: Option D
Solution (By JKExamLibrary)
Platelets adhere to damaged vessel walls, aggregate, and release clotting factors, forming a plug and initiating the coagulation cascade. RBCs carry oxygen, WBCs fight infection, lymphocytes are immune cells.

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Practice More Biology Questions

Question #1
The hormone that inhibits the secretion of gastric juice is:
A. Secretin
B. Gastrin
C. Cholecystokinin
D. Gastric inhibitory peptide

Correct Answer: Option D


Explanation:
GIP (glucose-dependent insulinotropic peptide) is released from the small intestine in response to fat and glucose, inhibiting gastric secretion and motility. Gastrin stimulates acid secretion, secretin stimulates bicarbonate, CCK stimulates gallbladder contraction.

This question belongs to: Science Biology
Question #2
Which of the following statements about the human skeleton is correct?
A. The tibia is a bone of the forearm.
B. The radius is located in the lower leg.
C. The patella is a bone of the arm.
D. The clavicle is known as the collarbone.

Correct Answer: Option D


Explanation:
The clavicle is the collarbone. Patella is kneecap; radius is forearm; tibia is shinbone. So B is correct.

This question belongs to: Science Biology
Question #3
The organ that is a part of both the digestive and endocrine systems is the:
A. Pancreas
B. Gall bladder
C. Spleen
D. Liver

Correct Answer: Option A


Explanation:
The pancreas acts as an exocrine gland (secreting digestive enzymes into the duodenum) and an endocrine gland (secreting insulin and glucagon into blood). The liver has metabolic but not major endocrine function, spleen is lymphoid, gall bladder stores bile.

This question belongs to: Science Biology