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Which hormone secreted by the atrial wall of the heart decreases blood pressure?
AAuricular narcotic factor
BAdrenal nutritive factor
CAtrial natriuretic factor
DArterial nutritive factor
Answer & Solution
Correct answer: C. Atrial natriuretic factor
1. Some organs that are not glands still secrete hormones.
2. The heart is one of them.
3. The atrial wall secretes a peptide hormone called atrial natriuretic factor, which decreases blood pressure.
4. So the answer is atrial natriuretic factor.
_Source: NCERT Class XI Biology, Ch 19 'Chemical Coordination and Integration'_
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