Nokea
Which digestive processes take place in the mouth (buccal) cavity?
- A. chemical digestion
- B. mechanical digestion
- C. dissolving of nutrients
- D. all of the above
Correct Answer: D
Rationale: In the mouth, food undergoes mechanical digestion via chewing, chemical digestion through salivary amylase, and dissolving of nutrients.
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Where are the osmoreceptors located?
- A. Kidney
- B. Hypothalamus
- C. Pituitary
- D. Liver
Correct Answer: B
Rationale: Osmoreceptors in the hypothalamus detect blood osmolarity changes.
Which is the longest organ of digestive system in human body?
- A. Pancreatic duct
- B. Small intestine
- C. Large intestine
- D. Esophagus
Correct Answer: B
Rationale: The small intestine is the longest part of the digestive system, measuring about 7 meters (22 feet). Its main functions are to complete the digestion of food and to absorb nutrients.
What is the name of the tube that carries food from the mouth to the stomach?
- A. Trachea
- B. Oesophagus
- C. Duodenum
- D. Food tube
Correct Answer: B
Rationale: The esophagus is the muscular tube that transports food from the mouth to the stomach. The trachea is for air, the duodenum is part of the small intestine, and 'food tube' is not a scientific term.
Which of the following describes one function of the stomach?
- A. To introduce carbohydrates to food.
- B. To remove excess water from food.
- C. To temporarily store food.
- D. To absorb nutrients into the bloodstream.
Correct Answer: C
Rationale: The stomach temporarily stores food, mixing it with gastric juices for digestion.
Absorption of digested food chiefly occurs in-
- A. Stomach
- B. Colon
- C. Small Intestine
- D. Large Intestine
Correct Answer: C
Rationale: The small intestine is the primary site for nutrient absorption due to its large surface area.