In the human circulatory system, the 'Hepatic portal vein' carries blood from the digestive tract to the: MCQ with Answer and Explanation

Question
In the human circulatory system, the 'Hepatic portal vein' carries blood from the digestive tract to the:
A. Kidneys
B. Liver
C. Lungs
D. Heart
Answer: Option B
Solution (By JKExamLibrary)
The hepatic portal vein is a unique blood vessel in the circulatory system that carries nutrient-rich, but potentially toxin-laden, blood from the gastrointestinal tract (stomach, intestines), spleen, and pancreas directly to the liver, rather than to the heart. This allows the liver to process absorbed nutrients, store glycogen, detoxify harmful substances, and regulate blood composition before the blood enters the systemic circulation via the hepatic veins to the inferior vena cava.
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Question #1
The scientist who discovered the vaccine for smallpox was:
A. Robert Koch
B. Louis Pasteur
C. Edward Jenner
D. Jonas Salk
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Correct Answer: Option C

Explanation:
Edward Jenner developed the first successful vaccine using cowpox to protect against smallpox in 1796. Pasteur developed rabies vaccine, Salk polio, Koch identified TB bacterium.
This question belongs to: Science Biology
Question #2
Chiasmata, the visible points of crossing over, become clearly visible during which sub-stage of Prophase I?
A. Diplotene
B. Pachytene
C. Zygotene
D. Leptotene
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Correct Answer: Option A

Explanation:
Chiasmata become clearly visible during the diplotene stage of Prophase I. While the actual exchange of genetic material (crossing over) occurs during the pachytene stage, the homologous chromosomes begin to repel each other and move apart in diplotene, remaining connected only at the sites of crossing over, which appear as X-shaped chiasmata. Exam tip: Pachytene = crossing over; Diplotene = chiasmata visible.
This question belongs to: Science Biology
Question #3
The 'Lymphatic system' in the human body is crucial for immunity and fluid balance. The largest lymphatic organ is the:
A. Spleen
B. Peyer's patches
C. Tonsils
D. Thymus
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Correct Answer: Option A

Explanation:
The spleen is the largest organ in the lymphatic system. It plays a vital role in immune function by filtering blood, producing lymphocytes, and removing old or damaged red blood cells and platelets. The thymus is crucial for T-cell maturation but is largest in childhood and shrinks with age. Tonsils and Peyer's patches are smaller, localized lymphoid tissues. The spleen acts as a major blood filter and immune response center.
This question belongs to: Science Biology
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