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A patient is found to have a deficiency in clotting factors. Which blood component is primarily responsible for clot formation?

A.

Plasma proteins

B.

Red blood cells

C.

Platelets

D.

White blood cells

Answer and Explanation

The Correct Answer is C

A. Plasma proteins: Plasma contains clotting (coagulation) proteins such as fibrinogen and other clotting factors that are essential to the coagulation cascade, but they require cellular elements to form a stable clot.
B. Red blood cells: Red blood cells are not responsible for initiating clot formation; they become trapped in the fibrin mesh of a clot but do not drive clotting.
C. Platelets: Platelets (thrombocytes) adhere to damaged endothelium, aggregate, and provide a phospholipid surface for coagulation enzyme complexes, playing a primary role in clot formation.
D. White blood cells: White blood cells participate in immune responses and inflammation but are not the primary cellular drivers of clot formation.


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Related Questions

Correct Answer is D

Explanation

A. Oxytocin:Oxytocin is synthesized in the hypothalamus and released from the posterior pituitary, not the anterior pituitary.
B. Antidiuretic hormone (ADH):ADH (vasopressin) is produced in the hypothalamus and released from the posterior pituitary, so it is not secreted by the anterior pituitary.
C. Cortisol:Cortisol is produced by the adrenal cortex in response to ACTH from the anterior pituitary; the anterior pituitary does not secrete cortisol itself.
D. Growth hormone (GH):Growth hormone is synthesized and secreted by the anterior pituitary and acts on many tissues to promote growth and metabolism.

Correct Answer is A

Explanation

A. Filtering lymph and housing lymphocytes:Lymph nodes filter lymph fluid to remove pathogens and debris and contain lymphocytes (B and T cells) and antigen-presenting cells that participate in immune responses.
B. Producing red blood cells:Red blood cell production occurs primarily in the bone marrow, not in lymph nodes.
C. Facilitating nutrient absorption:Nutrient absorption (notably fat absorption) occurs in the small intestine, particularly the villi and lacteals, rather than in lymph nodes.
D. Transporting oxygen:Oxygen transport is performed by red blood cells in the bloodstream, not by lymph nodes.

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