Question

1. what is the correct path of airflow to reach the alveoli? a) nose → pharynx → larynx → trachea → bronchi → bronchioles → alveoli b) mouth → esophagus → trachea → alveoli c) nose → larynx → pharynx → bronchi → alveoli d) nasal cavity → alveoli → bronchi → trachea 20. why is there such a large surface area for gas exchange in the lungs? a) the presence of 300 million alveoli b) the lungs connection to the diaphragm c) air is stored in bronchioles d) the trachea divides into two bronchi 21. which of the following best describes cellular respiration? a) movement of air in and out of the lungs b) the process that converts food energy into atp using oxygen c) the circulation of gases through the body d) filtering oxygen from the blood 22. what are the reactants of cellular respiration? a) co₂ and h₂o b) c₆h₁₂o₆ and o₂ c) o₂ and atp d) h₂o and energy 23. how are the respiratory and cardiovascular systems connected during cellular respiration? a) the respiratory system provides oxygen and removes carbon dioxide that the cardiovascular system transports b) the cardiovascular system produces oxygen for the respiratory system c) the respiratory system moves blood d) they operate independently 24. what is the main reason oxygen is needed in the body? a) it helps digest food b) it allows aerobic respiration to efficiently produce atp c) it carries hormones through the bloodstream d) it removes nitrogen waste

Explanation:

1. The correct anatomical pathway for airflow in the respiratory system is nose (or mouth, but mouth is not in correct sequence in other options) → pharynx → larynx → trachea → bronchi → bronchioles → alveoli.
2. Alveoli are tiny air - sacs. A large number (about 300 million) of alveoli in the lungs provides a large surface area for gas exchange (diffusion of \(O_2\) and \(CO_2\)).
3. Cellular respiration is a metabolic process. In aerobic cellular respiration, glucose (\(C_6H_{12}O_6\)) is broken down in the presence of oxygen (\(O_2\)) to produce ATP (adenosine triphosphate), which is the energy currency of the cell.
4. The chemical equation for aerobic cellular respiration is \(C_6H_{12}O_6+6O_2

ightarrow6CO_2 + 6H_2O+\text{Energy (ATP)}\). So the reactants are glucose (\(C_6H_{12}O_6\)) and oxygen (\(O_2\)).

1. The respiratory system takes in \(O_2\) (from the air) and releases \(CO_2\). The cardiovascular system (blood) transports \(O_2\) to cells and \(CO_2\) away from cells.
2. Aerobic respiration requires oxygen. It is a more efficient process (compared to anaerobic respiration) for producing ATP. ATP is used for various cellular functions such as muscle contraction, active transport, etc.

Answer:

1. A. Nose → Pharynx → Larynx → Trachea → Bronchi → Bronchioles → Alveoli
2. A. The presence of 300 million alveoli
3. B. The process that converts food energy into ATP using oxygen
4. B. \(C_6H_{12}O_6\) and \(O_2\)
5. A. The respiratory system provides oxygen and removes carbon dioxide that the cardiovascular system transports
6. B. It allows aerobic respiration to efficiently produce ATP