SCIENCE FORM 3 CHAPTER 1

Kaji maklumat di bawah

Study the information below.

J- Otak K- Saraf spina

brain spinal nerves

L- saraf tunjang M- saraf cranium

spinal cord cranial nerves

Antara berikut, yang manakah mewakili sistem saraf pusat?

Which of the following represent central nervous system?

• J dan K

  J and K

• J dan L

  J and L

• K dan M

  K and M

• J dan K

  J and K

Gambar rajah 1 menunjukkan laluan impuls setelah rangsangan diterima oleh kulit.

The diagram 1 shows the path of an impulse after a stimulus is received by the skin.

Antara berikut yang manakah mewakili X, Y dan Z?

Which of the following represents X, Y and Z?

• X - Otak/Brain, Y - Efektor/Effector, Z - Reseptor/Receptor

• X - Reseptor/Receptor, Y - Efektor/Effector, Z - Otak/Brain

• X - Otak/Brain, Y - Reseptor/Receptor, Z - Efektor/Effector

• X - Reseptor/Receptor, Y - Otak/Brain , Z - Efektor/Effector

Antara berikut, yang manakah merupakan tindakan terkawal?

Which of the following is a voluntary action?

• Peristalsis

  Peristalsis

• Bercakap

  Talking

• Berpeluh

  Sweating

• Denyutan jantung

  Heart beat

Rajah 2 menunjukkan keratan rentas kulit manusia.

Diagram 2 below shows a cross-section of human skin.

Pasangan stimuli manakah yang bergerak balas terhadap reseptor P dan Q?

Which pair of stimuli do receptors P and Q respond to?

• P - Sakit/Pain, Q - Tekanan/Pressure

• P - Sentuhan/Touch, Q - Sejuk/Cold

• P - Sejuk/Cold Q - Sakit/Pain

• P - Tekanan/Pressure, Q - Sentuhan/Touch

Rajah 3 menunjukkan laluan impuls suatu tindakan.

The diagram 3 shows the impulse pathway of an action.

Reseptor/Receptor -->Saraf tunjang/Spinal cord --> Efektor/Effector

Antara tindakan berikut, yang manakah akan melalui impuls yang sama?

Which of the following actions will pass through the same impulse pathway?

• Bernafas

  Breathing

• Berfikir

  Thinking

• Sentakan lutut

  Knee-jerk reaction

• Berjalan

  Walking

Antara hubungan organ deria dengan rangsangan di bawah, yang manakah tidak benar?

Which pair of the sensory organ with stimulus below, is not true?

• Mata/Eyes - Cahaya/Light

• Hidung/Nose - Udara/Air

• Lidah/Tongue - Bahan kimia/Chemical substances

• Telinga/Ear - Bunyi/Sound

Selain menerima rangsangan, fungsi-fungsi lain kulit adalah untuk

Other than receiving stimulus, the function of skin is

• Membantu menyingkirkan bahan kumuh

  Help to get rid of secreted subtances

• Mengawal atur suhu badan

  Control the body temperature

• Menghindarkan mikroorganisma daripada memasuki badan

  Preventing the microorganism from entering body

Kepekaan kulit terhadap rangsangan dipengaruhi oleh

The sensitivity of skin to the stimulus is effected by

• Ketebalan lapisan lemak

  Thickness of fat layer

• Ketebalan dermis

  Thickness of dermis

• Jenis rangsangan

  Type of stimulus

• Bilangan reseptor

  Number of receptors

Antara yang berikut, yang manakah tidak benar tentang hidung?

Which of the following is not correct about nose?

• Sel- sel deria terletak di bawah hidung

  Sensory cells are located under the nose

• Hidung ialah organ deria untuk deria bau

  The nose is a sensory organs for a sense of smell

• Jumlah cecair meningkat semasa seseorang menghidapi selesema

  The amount of fluid increases when a person suffers from flu

• Sel –sel peka bau di dalam hidung amat sensitif terhadap bahan kimia

  Sensitive cells in the nose are very sensitive to chemicals

Rajah 4 menunjukkan keratan melalui sebahagian kepala manusia yang mengandungi organ deria.

Diagram 4 shows a section through part of the human head containing a sensory organ.

Antara bahagian berlabel A, B, C dan D, yang manakah sel deria?

Which of the parts labelled A, B, C and D, is a sensory cell?

• A

• B

• C

• D