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Human Organ System Human Circulatory System Microbial Growth & Nutrition Hygiene and Nutrition Metabolism Nutrient Cycling The Ear Musculoskeletal Fitness Human Genetics Facial & Dental Injuries Nasal Polyp Excretory and Musculoskeletal System Confusion, Dementia, & Alzheimers Disease Anatomy Respiratory System Microorganisms, Health and Diseases

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Bacteriology › View

Microaerophilic bacteria are those which require

A. 21% oxygen for growth

B. low levels of oxygen for growth (lesser than O2 present in atmosphere)

C. oxygen for activation of enzymes

D. none of the above

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Respiratory System › View

The walls of the alveoli and capillaries are permeable. What does this mean?

A. Substances can pass through them.

B. They are made of muscle.

C. They are located throughout the body.

D. They are made of bone.

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