13.1. Excretion in humans
A subsection of Biology, 0610, through 13. Excretion in humans
Listing 10 of 267 questions
The box on the left shows the beginning of a sentence. The boxes on the right show some sentence endings. Draw two straight lines from ‘Excretion’ to the boxes on the right to make two correct sentences. Excretion is the removal of excess substances from an organism. is the removal of toxic materials from an organism. is the taking in of materials for energy and growth. is the movement of digested food molecules into cells. is the passing out of undigested food from an organism. The kidney filters the blood and produces a liquid called urine. State three substances that are found in the urine of a healthy person. is a diagram of part of the human excretory system and associated blood vessels. P R Q Key: direction of blood flow State the names of parts P, Q and R in . P Q R The volume and concentration of urine produced is affected by changes in water consumption, temperature and exercise levels. Table 6.1 shows three different conditions. Complete Table 6.1 by writing increases or decreases in the boxes to show the effect of each condition on the volume and concentration of urine produced. Table 6.1 condition volume of urine concentration of urine increase in water consumption increase in temperature increase in exercise level Protein can be broken down into amino acids. List four chemical elements that are always found in protein. State the name of the organ in the human body that breaks down excess amino acids. shows some chemical reactions that are catalysed by enzymes. The enzyme catalysing the reaction is shown on the arrow. Complete by filling in the names of the four missing molecules. amylase starch protein amino acids lipase fats and
0610_w20_qp_33
THEORY
2020
Paper 3, Variant 3
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