Nokea
Saliva contains two enzymes. What are they?
- A. Amylase and pepsin
- B. Amylase and lysozyme
- C. Amylase and lipase
- D. Amylase and renin
Correct Answer: B
Rationale: Saliva contains salivary amylase (ptyalin) for starch digestion and lysozyme for antibacterial action. Pepsin is in the stomach, lipase is mainly pancreatic, and renin is unrelated to saliva.
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The cells of the epithelial lining in the vertebrate stomach are not damaged by HCl because of
- A. Mucus secretion covering the epithelium
- B. Neutralization of HCl by alkaline gastric juice
- C. HCl being dilute
- D. Epithelium being resistant to HCl
Correct Answer: A
Rationale: Mucus secreted by gastric cells forms a protective barrier against HCl, preventing damage to the stomach lining.
All enzymes involved in protein digestion are:
- A. secreted by the pancreas
- B. activated by HCl
- C. present in the stomach
- D. secreted in an inactive form
Correct Answer: D
Rationale: Protein-digesting enzymes like pepsinogen and trypsinogen are secreted in an inactive form and activated later.
Which part of the nervous system controls the digestive system?
- A. Somatic
- B. Digestic
- C. Autonomic
- D. Central Nervous system
Correct Answer: C
Rationale: The autonomic nervous system regulates involuntary digestive processes like peristalsis and secretion.
What waste does the integumentary system remove from the body?
- A. liquid waste
- B. carbon dioxide
- C. salt and water
- D. urea
Correct Answer: C
Rationale: The integumentary system, via sweat glands, removes salt and water through perspiration.
The liver facilitates the conjugation of bilirubin with glucuronic acid, resulting in the formation of bilirubin glucuronide. The primary objective of this process is to:
- A. Convert bilirubin into a form suitable for storage within the body
- B. Generate bile salts required for the absorption of lipids
- C. Enable the transportation of bilirubin in the blood to sites where it can be utilized
- D. Render bilirubin water-soluble, facilitating its excretion in the urine
Correct Answer: D
Rationale: Conjugation makes bilirubin water-soluble, allowing its excretion in bile and urine, preventing accumulation.