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5 (a) The diagram shows two vessels found in the stems of plants - Edexcel - GCSE Biology - Question 5 - 2013 - Paper 1
Question 5
5 (a) The diagram shows two vessels found in the stems of plants. (i) Name the vessel that transports water and mineral ions through the plant. (1) (ii) Energy i... show full transcript
Worked Solution & Example Answer:5 (a) The diagram shows two vessels found in the stems of plants - Edexcel - GCSE Biology - Question 5 - 2013 - Paper 1
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Suggest why the percentage of blood going to each of the body parts changes when a person exercises.
Answer
When a person exercises, the muscle cells require more oxygen and nutrients to sustain increased activity. Consequently, more blood is directed to the muscles to meet this demand. In contrast, other body parts such as the brain and liver receive less blood as their immediate need for oxygen during exercise decreases. This redistribution of blood flow optimizes physical performance and energy use.
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Describe how the circulatory system transports substances around the body.
Answer
The circulatory system is responsible for transporting essential substances throughout the body. It consists of the heart, blood vessels, and blood. The heart pumps oxygenated blood from the lungs through the arteries to various tissues and organs. Nutrients absorbed from the digestive system enter the bloodstream and are delivered to cells for energy and growth. Additionally, the circulatory system transports hormones, immune cells, and waste products like carbon dioxide back to the lungs and kidneys for excretion. This constant circulation maintains homeostasis and supports overall body function.