Heparin and Histamine from Mast Cells Function to Directly Cause

question 22

Multiple Choice

Heparin and histamine from mast cells function to directly cause

• A) conversion of fibrinogen to fibrin.
• B) neutrophils to kill invading microorganisms.
• C) vasoconstriction.
• D) vasodilation.

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Definitions:

Reticular Formation

A network of neurons located in the brainstem that plays a key role in controlling arousal, wakefulness, and focusing attention.

Sleep

A state of rest characterized by altered consciousness, reduced activity, and a decreased response to external stimuli.

Arousal

A physiological and psychological state of being awake or reactive to stimuli, often associated with increased heart rate, alertness, and energy.

Medulla

A portion of the brainstem involved in autonomic functions such as breathing, heart rate, and blood pressure.