Page 74 - Hybrid PBD Sains TG1_Edisi Guru

BAB

3 Koordinasi dan Gerak Balas

Coordination and Response

FOKUS TOPIK Peta Konsep

Dalam Manusia / In Humans

Kawal Atur Kandungan Air / Regulation of Water Content
Kandungan air Otak merangsang Banyak air kencing Kandungan air
meningkat perembesan dihasilkan berkurang
Water content increases hormon More urine is produced Water content decreases
The brain stimulates
Aras air normal hormone secretion Aras air normal
Normal water level Normal water level
Otak merangsang
Kandungan air perembesan Kurang air kencing Kandungan air
berkurang hormon dihasilkan meningkat
Water content decreases The brain stimulates Less urine is produced Water content increases
hormone secretion

Kawal Atur Suhu Badan / Regulation of Body Temperature
Suhu badan • Salur darah mengembang • Bulu roma condong Suhu badan
meningkat Blood vessels dilate Hairs lie flat menurun
Body temperature • Berpeluh • Hormon kurang Body temperature
increases Sweating dirembeskan decreases
Hormones are secreted less
Suhu badan normal Suhu badan normal
Normal temperature Normal temperature
• Salur darah mengecut • Bulu roma menegak
Suhu badan Blood vessels constrict Hairs erect Suhu badan
menurun • Menggigil • Hormon dirembeskan meningkat
Body temperature Shivering Hormones are secreted Body temperature
decreases increases

Homeostasis / Homeostasis Dalam Tumbuhan / In Plants
Dalam Haiwan / In Animals Pengawalaturan persekitaran dalam
organisma supaya berfungsi dalam Transpirasi / Transpiration
• Haiwan homoioterma keadaan optimum. Proses kehilangan air dari daun
dapat mengawal atur Regulation of the internal environment of an ke persekitaran melalui stoma
suhu badan tanpa organism so that it will function at an dalam bentuk wap air.
dipengaruhi oleh suhu optimum condition. The process of plants losing water from
the leaves into the environment in the
persekitaran. form of water vapour through stomata.
Homeotherms could regulate
their body temperature
without being affected by the Sel Stoma terbuka pada siang hari
pengawal
surrounding temperature. Guard cell supaya pertukaran gas berlaku.
Stoma Stomata open during the day to allow gas
terbuka exchange occur.
• Haiwan poikiloterma tidak dapat Stoma opens
mengekalkan suhu badannya dan
dipengaruhi oleh suhu persekitaran. Sel Stoma tertutup pada hari yang
Poikilotherms cannot maintain their body pengawal terlalu panas untuk mengurangkan
Guard cell
temperature and always affected by the kehilangan air.
surrounding temperature. Stoma Stomata close during a very hot day to reduce
tertutup the water loss.
Stoma closed

33 © Penerbitan Pelangi Sdn. Bhd.

03 HYBRID SAINS TG1.indd 33 27/07/2021 12:13 PM