Human Heart - 50 Important MCQs

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 1. The human heart has how many chambers? A) 2 B) 3 C) 4 ✅ D) 5 Answer: C) 4 Explanation: The human heart has four chambers—two atria and two ventricles. 2. Which side of the heart pumps oxygenated blood to the body? A) Right side B) Left side ✅ C) Both sides D) Middle chamber Answer: B) Left side Explanation: The left side pumps oxygen-rich blood through the aorta to the body. 3. Which blood vessel carries blood away from the heart? A) Vein B) Capillary C) Artery ✅ D) Venule Answer: C) Artery Explanation: Arteries carry blood away from the heart. 4. Which chamber receives oxygenated blood from the lungs? A) Right atrium B) Right ventricle C) Left ventricle D) Left atrium ✅ Answer: D) Left atrium Explanation: Oxygenated blood enters the left atrium through the pulmonary veins. 5. Which chamber has the thickest wall? A) Right atrium B) Left atrium C) Right ventricle D) Left ventricle ✅ Answer: D) Left ventricle Explanation: It pumps blood to the entire body. 6. The normal resting h...

HUMAN DIGESTIVE SYSTEM

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    Human digestive system
1. The digestive system breaks down food into simpler substances for absorption.
2. Digestion begins in the mouth.
3. The main function of digestion is ingestion, digestion, absorption, assimilation, and egestion.
4. The alimentary canal in humans is about 8–9 meters long.
5. The digestive tract starts from the mouth and ends at the anus.

PARTS OF THE DIGESTIVE SYSTEM

1. Mouth
2. Pharynx
3. Esophagus (Food Pipe)
4. Stomach
5. Small Intestine
6. Large Intestine
7. Rectum
8. Anus

ACCESSORY ORGANS

1. Salivary Glands
2. Liver
3. Gall Bladder
4. Pancreas

MOUTH

1. Digestion starts in the mouth.
2. Teeth help in chewing food.
3. Tongue helps in tasting and swallowing food.
4. Saliva is secreted by salivary glands.
5. Saliva contains the enzyme Salivary Amylase (Ptyalin).
6. Salivary amylase digests starch into simpler sugars.

TEETH FACTS

1. An adult human has 32 teeth.
2. A child has 20 milk teeth.
3. Types of teeth:
   - Incisors (Cutting)
   - Canines (Tearing)
   - Premolars (Crushing)
   - Molars (Grinding)

ESOPHAGUS (FOOD PIPE)

1. Connects the mouth to the stomach.
2. Food moves through peristaltic movement.
3. No digestion occurs here.

STOMACH

1. J-shaped muscular organ.
2. Stores food temporarily.
3. Produces gastric juice.
4. Gastric juice contains:
   - Hydrochloric Acid (HCl)
   - Pepsin
   - Mucus
5. Pepsin digests proteins.
6. HCl kills harmful germs and provides acidic medium.

SMALL INTESTINE

1. Longest part of the digestive system.
2. About 6 meters long.
3. Main site of digestion and absorption.
4. Divided into:
   - Duodenum
   - Jejunum
   - Ileum
5. Contains finger-like projections called Villi.
6. Villi increase the surface area for absorption.

LIVER

1. Largest gland in the human body.
2. Weighs about 1.5 kg.
3. Produces bile juice.
4. Bile helps in fat digestion.
5. Bile is stored in the gall bladder.

GALL BLADDER

1. Small pear-shaped organ.
2. Stores bile juice.
3. Releases bile into the small intestine.

PANCREAS

1. Mixed gland (Endocrine and Exocrine).
2. Produces pancreatic juice.
3. Pancreatic enzymes digest carbohydrates, proteins, and fats.
4. Produces insulin and glucagon.

LARGE INTESTINE

1. Absorbs water and minerals.
2. Forms feces.
3. Contains beneficial bacteria.

RECTUM

1. Temporary storage site of feces.

ANUS

1. Final opening of the digestive tract.
2. Undigested waste is expelled through it.

IMPORTANT ENZYMES

1. Salivary Amylase – Starch digestion.
2. Pepsin – Protein digestion.
3. Trypsin – Protein digestion.
4. Lipase – Fat digestion.
5. Maltase – Maltose digestion.

IMPORTANT FACTS

1. Largest gland – Liver.
2. Longest part of alimentary canal – Small Intestine.
3. Digestion starts in – Mouth.
4. Most absorption occurs in – Small Intestine.
5. Water absorption occurs mainly in – Large Intestine.
6. Bile is produced by – Liver.
7. Bile is stored in – Gall Bladder.
8. Protein digestion begins in – Stomach.
9. Starch digestion begins in – Mouth.
10. Human digestive system performs both mechanical and chemical digestion.

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