★ Breathing System Quiz
What is the percentage of nitrogen in inhaled air?
A. 78%
B. 21%
C. 0.04%
D. Variable
Select your answer:
Topics:
Urinary Limitation of Senses Herd Immunity Respiratory System Defence against Infectious Diseases Health and Diseases Vocabulary - Health Cell and Muscle Histology Differentiation and Division of Human Cells Oronasal Suctioning Radiography Immunology and Serology Communicable Diseases and Immune Response (OCR) Macromolecules & Nutrients Microbial GrowthOther quiz:
Human Digestive System › ViewThe enzyme that acts on carbohydrates
A. pepsin
B. trypsin
C. lipase
D. amylase
Respiratory System › View
The cartilage that closes the larynx to prevent food from entering the trachea is called
A. Vestibular fold
B. Epiglottis
C. Thyroid cartilage
D. Adam’s apple