Question

Which of the following statements about respiration is false:

	a.	Respiration can refer to a chemical process that takes place inside human cells
	b.	Respiration can refer to breathing (gas exchange) in humans
	c.	Respiration is an endergonic (energy-requiring) process overall in humans
	d.	In respiration oxygen (O2) is taken in/used and carbon dioxide (CO2) is given off/produced

In the reaction CO₂ + H₂O –> H₂CO₃ –> H⁺ + HCO₃^– bicarbonate is symbolized by:

	a.	CO2
	b.	H2O
	c.	H2CO3
	d.	HCO3–

Which of the following statements about molecular oxygen (O₂) is false?

	a.	Molecular oxygen (O2) dissolves very easily in water
	b.	Molecular oxygen (O2) makes up 21% of atmospheric air
	c.	Molecular oxygen (O2) is required for aerobic cellular respiration
	d.	Molecular oxygen (O2) is more common in the atmosphere than carbon dioxide

Which of the following statements about gas exchange in humans is true?

	a.	Humans use almost all of the oxygen (O2) taken in during inhalation
	b.	Carbon dioxide (CO2) is the most common gas in exhaled air
	c.	Nitrogen (N2) is the most common gas taken in during inhalation
	d.	There is usually very little water vapor (H2 O) in exhaled air

Which of the following sequences accurately describes the pathway of air flow during inhalation?

	a.	external nares —> glottis —> nasal conchae —> pharynx —> trachea —> bronchi —> alveoli
	b.	external nares —> pharynx —> nasal conchae —> glottis —> trachea —> bronchi —> alveoli
	c.	external nares —> nasal conchae —> pharynx —> glottis —> trachea —> bronchi —> alveoli
	d.	external nares —> nasal conchae —> pharynx —> glottis —> bronchi —> trachea —> alveoli

Answer 1

First question.

Respiration is and enderogenic process in humans. It's false. In humans respiration does not need energy. Other than that respiration is used to produce or release energy.

Second question.

It's HCO3- . It's the chemical formula of Bicarbonate. H2CO3 is carbonic acid, H2O is water, CO2 is carbon dioxide.

Third question.

Oxygen dissolve in water easily. It's false. It's not that easy to dissolve ocygen in water. We may need to use high pressure for such a process

Fourth question

Nitrogen is the major common gas in inhaled air. It's the most abundant gas in atmosphere. So the inhaled air contain more oxygen

Fifth question.

Correct order is external nares-> nasal conchae -> pharynx-> glottis -> trachea ->bronchi -> alveoli