Question

1. rico, a scuba diver, uses breathing gear to help him breathe air underwater. he always gets enough sleep and eats a good breakfast before a dive. what could happen if his breathing gear broke during a dive and he could not breathe as much air as usual?

it would be difficult to swim, because his cells cannot work without molecules from air.

it would not affect him because his cells are getting the different types of molecules they need from food to work properly.

it would not affect him as long as he slept enough.

it would not affect him because his body can function normally even if his cells do not have molecules from

1. a student thinks that the human body only works properly when cells are getting molecules from food and molecules from air. is the student correct?

responses

yes, the body only works when cells get molecules from food and molecules from air.

no, the body only works when cells are getting molecules from different types of food.

no, the body only works when the lungs get molecules from air, and the stomach gets molecules from food.

no, the body works as long as cells are making all the molecules they need.

Explanation:

Question 14

• For the first option: Cells need oxygen (from air) for cellular respiration to produce energy. Without enough air, cells can't get enough oxygen, so energy production is reduced, making swimming difficult.
• Second option: Cells need molecules from both food and air (oxygen) to function. Food provides nutrients, but air provides oxygen for respiration. So this is incorrect.
• Third option: Sleep helps recovery, but it doesn't replace the need for air (oxygen) for cell function. So this is incorrect.
• Fourth option: The body can't function normally without molecules (oxygen) from air for cell respiration. So this is incorrect.

• Human cells need molecules from food (nutrients like glucose, amino acids) and molecules from air (oxygen). Food molecules are broken down to release energy, and oxygen is needed for aerobic respiration to efficiently release that energy.
• Second option: Incorrect, as cells need both food and air molecules.
• Third option: Incorrect, because it's cells (not just lungs or stomach) that need these molecules, and the process is more than just lungs getting air and stomach getting food (cells use the molecules after digestion/respiration).
• Fourth option: Cells can't make all molecules they need; they rely on external sources (food and air) for essential molecules.

Answer:

The option: "It would be difficult to swim, because his cells cannot work without molecules from air."

Question 15