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Biology Chapter on Circulation and Ecosystems

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Biology Chapter on Circulation and Ecosystems

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Questions and Answers

What happens to fluid after it leaves the circulatory system?

It is directly excreted by the kidneys.

It circulates back into the arteries.

It enters the lymphatic system for filtration. (correct)

It is absorbed by surrounding tissues without any process.

How does blood flow through the heart during a cardiac cycle?

From the left atrium through the pulmonary artery.

From the left ventricle directly to the lungs.

From the right atrium to the right ventricle and then to the lungs. (correct)

From the right atrium to the left ventricle directly.

How are gases exchanged during breathing?

Oxygen enters the bloodstream while carbon dioxide leaves through diffusion in the alveoli. (correct)

Oxygen is absorbed in the blood only during exhalation.

Gases are exchanged in the bronchi rather than the alveoli.

Carbon dioxide enters the lungs through the alveoli.

What makes it easy to breathe?

The diaphragm contracts to create negative pressure in the lungs. Signup and view all the answers

What controls the process of breathing?

The brainstem monitors carbon dioxide and oxygen levels. Signup and view all the answers

What is the primary role of producers in an ecosystem?

Converting sunlight into energy Signup and view all the answers

What percentage of energy typically transfers to the next trophic level?

10% Signup and view all the answers

What key role do bacteria play in the Nitrogen Cycle?

Nitrification and decomposition Signup and view all the answers

Which of the following correctly describes a niche?

The role and position a species has in its environment Signup and view all the answers

What happens to an animal cell placed in a hypertonic solution?

It shrinks and may undergo crenation Signup and view all the answers

What is ATP primarily used for in cells?

Providing energy for cellular processes Signup and view all the answers

Which of the following statements best describes fermentation?

An anaerobic process producing energy without oxygen Signup and view all the answers

Which component of blood vessels carries blood away from the heart?

Arteries Signup and view all the answers

What best describes the function of the heart's left atrium?

Receiving oxygenated blood from the lungs Signup and view all the answers

What differentiates prokaryotic cells from eukaryotic cells?

Presence of membrane-bound organelles Signup and view all the answers