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The Excretory system — Biology STD 10 — Question

ICSE BoardEnglish MediumSTD 10BiologyThe Excretory system1 Mark
MCQ
Sphincter:
  • ✓
    Circular muscle that guards the opening of urinary bladder into urethra.
  • B
    Passage of blood cells through the intact walls of the capillaries.
  • C
    Removal of harmful and unwanted nitrogenous waste products from the body.
  • D
    Reabsorption of glucose, amino acids including phosphate and citrate.
✓

Answer

Correct option: A.
Circular muscle that guards the opening of urinary bladder into urethra.
(a) Circular muscle that guards the opening of urinary bladder into urethra.
Explanation:
Sphincter muscle is a ring-shaped muscle that relaxes or tightens to open or close a passage or opening in the body. Examples are the anal sphincter (around the opening of the anus) and the pyloric sphincter (at the lower opening of the stomach).

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