Let’s Analyse:
1. Arun has just finished a 400 m race. Will the blood flow be faster or slower when Arun
runs. Give reason for your answer.
( Hint: Blood contains something that you need more of while exercising).
2. The function of the excretory system is similar to which of the following?
a) Evaporation. b) Condensation. c) Filtration. d) Soil erosion.
Give one reason to support your answer.
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Answers
Answer:
1.blood will flow faster as heart beats will be also fast
2.Cells produce water and carbon dioxide as by-products of metabolic breakdown of sugars, fats, and proteins. Chemical groups such as nitrogen, sulfur, and phosphorous must be stripped, from the large molecules to which they were formerly attached, as part of preparing them for energy conversion. The continuous production of metabolic wastes establishes a steep concentration gradient across the plasma membrane, causing wastes to diffuse out of cells and into the extracellular fluid.
Single-celled organisms have most of their wastes diffuse out into the outside environment. Multicellular organisms, and animals in particular, must have a specialized organ system to concentrate and remove wastes from the interstitial fluid into the blood capillaries and eventually deposit that material at a collection point for removal entirely from the body.
Answer:
blood contains something that you need more of while exercising