200 Science Investigations for Young Students: Practical by Martin W Wenham

By Martin W Wenham

This publication offers fabrics to permit scholars elderly 5-11 years to benefit concerning the global round them via hands-on actions.

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When we engage in physical activity we increase the rate at which our muscles are working, and so the rate of respiration ( ':· 3 . 6 ) . This has readily observable effects on pulse-rate, the sound made by the heart beating, breathing, skin temperature and cooling responses. 1 Exercise and the action of the heart EqUipment: Stop-clock or watch, or clock with second-hand; Simple stethoscope (Fig. 3. g. stage-block) about 20cm high, for step-ups. 30 HUMANS AS ORGANISMS Work with a partner. Before you start, make sure that each of you can find and count the other's pulse (see Activity 3 .

Start counting each minute) ; multiply each result by two to find the resting pulse-rate in beats per minute. • While your pulse is being counted, listen to your heart-beat using the simple stethoscope ( Activity 3 . 8 . 1 ) . Try to remember how loud the sound is. • You should now exercise for about 3 minutes. A suitable exercise is to do step­ ups; aim to do between 20 and 30 each minute. ) • As soon as the exercise period is finished, sit down. Your partner should now begin taking your pulse again, as before, and continue until your pulse-rate re­ turns to its resting level for three counts.

G. horses, cattle, deer, bats and some dogs such as faxes. Activity 3 . 5 Hearing: judging direction Although humans lack the ability to locate sounds by moving their external ears in the way that many animals can, we learn to locate the sources of sounds quite 36 HUMANS AS ORGANISMS accurately by using both ears at once ( binaural hearing), an ability analogous to binocular vision ( see Activity 3 . 1 0. 3 ) . A simple test is for a subject, blindfolded o r with both eyes shut, t o try t o locate a repeated sound in a quiet room with both ears open and then with one ear shut, using a finger pressing on the flap j ust in front of the ear opening.

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