Page 89 - APS(2022)_TG1 _Edisi Guru

Sains
ingkata
T
n 1
Bab 3
Sains Tingkatan 1 Bab 3

Tarikh:
arikh:
T
EKSPERIMEN 3.3 Kesan Tugas Berat terhadap Kadar Degupan Jantung
Wajib Effect of Heavy Tasks on Heart Rate Pendekatan inkuiri
Tujuan Mengkaji tindakan biologi yang memberi gerak balas terhadap aktiviti fizikal yang cergas
Aim To study the biological actions that respond to vigorous physical activities
Pernyataan Adakah kadar degupan jantung semakin meningkat apabila melakukan aktiviti fizikal yang
Masalah cergas?
Problem statement Does the heart rate increase when carrying out vigorous physical activities?

Radas Jam randik
Apparatus Stopwatch

Hipotesis Kadar degupan jantung meningkat apabila melakukan aktiviti fizikal yang cergas.
BAB
BAB
Hypothesis
Heart rate increases when carrying out vigorous physical activities.
3
3
Pemboleh Ubah (a) yang dimanipulasikan : Jenis aktiviti
Variables
that is manipulated Type of activities
(b) yang bergerak balas : Suhu badan dan kiraan denyutan nadi
that is responding Body temperature and pulse count

(c) yang dimalarkan : Tempoh masa aktiviti
that is kept constant Duration of activity

Prosedur 1. Bahagikan murid-murid kepada beberapa kumpulan. 15 saat
Procedure Divide the students into several groups. 15 seconds
2. Pilih seorang ahli kumpulan dan ukur kadar degupan jantungnya
seperti dalam Rajah (a):
Select one group member and measure his / her heart rate as shown in Diagram (a):
Rajah (a) / Diagram (a)
• Gunakan dua jari, sebaik-baiknya jari ke-2 dan ke-3, dan
letakkan pada pergelangan tangan (Rajah (a)). Gerakkan jari perlahan-lahan sehingga
anda boleh merasa denyutan.
Use two fingers, preferably 2nd and 3rd fingers, and place them on the wrist (Diagram (a)). Move your fingers
slowly until you can feel the pulse.
• Kira bilangan denyutan selama 15 saat.
Count the number of pulses for 15 seconds.
• Guna rumus di bawah untuk mengira kadar degupan jantung bagi seminit (60 saat).
Use the formula below to calculate the heart rate for a minute (60 seconds).

Kadar degupan jantung seminit = Bilangan denyutan selama 15 saat × 4
Heart rate per minute = Number of pulses for 15 seconds × 4

3. Minta ahli kumpulan itu berjoging dan lompat bintang selama satu minit dan ukur kadar
degupan jantungnya.
Ask the group member to jog and jumping jacks for one minute and measure the heart rate.
4. Rekodkan pemerhatian anda dalam jadual.
Record your observations in the table.

NOTA / NOTES:
Pastikan murid yang melakukan senaman itu dalam keadaan rehat (tidak aktif) sebelum
memulakan setiap aktiviti.
Make sure that the student who does the exercises is in the state of rest (inactive) before starting each activity.

© Penerbitan Pelangi Sdn. Bhd.
© P enerbitan P elangi S dn. B hd. 56

03 APS SAINS TG1.indd 56 21/07/2021 8:33 AM