lesson 3.1 part 2
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Lesson 3.1 (Part 2)
Gerakbalas & Koordinasi
Disediakan Oleh:NUR SUHAIDAH SUKOR
SMK SANDAKAN, SABAH
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Gerakbalas dan Koordinasi
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Induksi
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Koordinasi adalah proses menerima rangsangan dan hasilkan tindakbalas bersesuaian.
Koordinasi dan gerak balas berlaku dalam;a) sistem sarafb) sistem endokrin
Homeostasisperubahan dalam persekitaran dalam dan dikawal oleh mekanisme tindakbalas negatif.
Koordinasi
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Koordinasi Badan
Sistem EndokrinSistem Saraf
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Receptors for Internal Stimuli
Rangsangan Jenis Reseptor Lokasi ReseptorSuhu badan Thermoreseptor hipotalamusKepekatan Osmosis Darah
Osmoreseptor hipotalamus
pH darah (kandungan CO2)
Kemoreseptor Medulla oblongata, aorta and arteri karotid
Aras gula dalam darah
Kemoreseptor Pankreas
Tekanan darah Baroreseptor Jantung dan arteri
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Pengawalaturan Persekitaran Dalaman
Tindakbalas Negatif- Badan bertindakbalas dengan menghasilkan mekanisme pembetulan pada arah bertentangan.
Contoh•Apabila suhu badan naik melebihi aras normal,•Badan menghasilkan peluh,•Suhu badan turun ke aras normal.
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Mekanisme Pengawalaturan Negatif
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Proses Penghantaran Maklumat
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Aktiviti (2): Mekanisme Pengawalaturan Negatif
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Ringkasan Pembelajaran