Active Transport in Biology

In which of the following scenarios does diffusion play a significant role?

Oxygen and carbon dioxide exchange in the lungs

Why does active transport occur in root hairs for mineral ions uptake?

Due to the higher concentration of mineral ions in the cells

How does the adaptation of a high surface area to volume ratio benefit single-celled organisms?

It enhances the efficiency of diffusion

What is a key function of active transport in the gut for absorbing substances like glucose and amino acids?

To counteract the lower concentration of sugar molecules in the gut Signup and view all the answers

Why is active transport necessary for moving sugar molecules from the gut into the bloodstream?

Due to a higher concentration of sugar molecules in the gut than in the blood Signup and view all the answers

Why can single-celled organisms rely on diffusion for transporting molecules?

They have a relatively large surface area to volume ratio. Signup and view all the answers

Why can't multicellular organisms rely on diffusion alone for transporting molecules?

They have a small surface area to volume ratio. Signup and view all the answers

In the lungs, where does the transfer of oxygen and carbon dioxide primarily occur?

Alveoli Signup and view all the answers

What is the role of villi in the small intestine?

Absorb digested food into the bloodstream Signup and view all the answers

Why do single-celled organisms have low metabolic demands?

Because they have high surface area to volume ratio Signup and view all the answers

Why do multicellular organisms need adaptations for molecule transport?

Due to their small surface area to volume ratio Signup and view all the answers

What is the main function of lamellae in fish gills and leaves?

Increase surface area Signup and view all the answers

How do alveoli and capillary walls in the lungs facilitate gas exchange?

By being extremely thin Signup and view all the answers

What is the purpose of the single layer of surface cells in the villi of the small intestine?

Increase absorption capacity Signup and view all the answers

Why is having a short diffusion pathway important for the efficiency of processes like nutrient absorption?

It speeds up the process Signup and view all the answers

How does the constant exchange of oxygen and carbon dioxide in the lungs help maintain a steep concentration gradient?

By keeping a continuous supply of oxygen to the blood Signup and view all the answers

In which direction does water flow in fish gills and how does this maintain a steep concentration gradient?

Water flows opposite to blood flow, maintaining high oxygen levels in water Signup and view all the answers

Active Transport in Biology

Questions and Answers

In which of the following scenarios does diffusion play a significant role?

Why does active transport occur in root hairs for mineral ions uptake?

How does the adaptation of a high surface area to volume ratio benefit single-celled organisms?

What is a key function of active transport in the gut for absorbing substances like glucose and amino acids?

Why is active transport necessary for moving sugar molecules from the gut into the bloodstream?

Why can single-celled organisms rely on diffusion for transporting molecules?

Why can't multicellular organisms rely on diffusion alone for transporting molecules?

In the lungs, where does the transfer of oxygen and carbon dioxide primarily occur?

What is the role of villi in the small intestine?

Why do single-celled organisms have low metabolic demands?

Why do multicellular organisms need adaptations for molecule transport?

What is the main function of lamellae in fish gills and leaves?

How do alveoli and capillary walls in the lungs facilitate gas exchange?

What is the purpose of the single layer of surface cells in the villi of the small intestine?

Why is having a short diffusion pathway important for the efficiency of processes like nutrient absorption?

How does the constant exchange of oxygen and carbon dioxide in the lungs help maintain a steep concentration gradient?

In which direction does water flow in fish gills and how does this maintain a steep concentration gradient?

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