The Human Nervous System
Bayani Gaba-gaba
Touch something scalding and your arm is already moving before you have decided anything. You did not choose it, you could not have stopped it, and the pain arrives afterwards like a report filed late. That tiny gap between the injury and the feeling is the most revealing thing your body does all day, because it shows that a decision was taken somewhere other than in your thoughts.
This lesson follows a single signal from the skin of a fingertip to the muscle that pulls the hand clear. You will meet the three kinds of neurone and learn which direction each one carries traffic, see what actually crosses the tiny gap between one nerve cell and the next, and take apart a pain-withdrawal reflex step by step. By the end you will be able to take any piece of behaviour an examiner puts in front of you, however unfamiliar the animal or the situation, and lay it out as stimulus, receptor, coordinator, effector, response.
Manufura
- The nervous system enables humans to react to their surroundings and to coordinate their behaviour.
- Information from receptors passes along cells (neurones) as impulses to the central nervous system (CNS). The CNS is the brain and spinal cord. The brain coordinates the response.
- Reflex actions are automatic and rapid. They often involve sensory, relay and motor neurones.
- In a simple reflex action such as a pain-withdrawal reflex: impulses from a receptor pass along a sensory neurone to the CNS; at a junction (synapse) between a sensory neurone and a relay neurone in the CNS, a chemical is released that causes an impulse to be sent along a relay neurone; a chemical is then released at the synapse between a relay neurone and motor neurone in the CNS, causing impulses to be sent along a motor neurone to the effector; the effector is either a muscle or a gland: a muscle responds by contracting and a gland responds by releasing (secreting) chemical substances.
- Effectors include muscles and glands. Students should be able, when provided with appropriate information, to analyse a particular given example of behaviour in terms of: stimulus → receptor → coordinator → effector → response
Taswirar tunani
An zana wannan batu don ka ga yadda ra'ayoyi ke hadewa.
Bude taswirar tunani a cikin manhaja
Takardar Darasi
Cikakken Bayanin Darasi Yana Kan Manhajar Green Bridge
Sami manhajar Green Bridge CBT a wayarka ko kwamfutarka domin cikakken laburaren IGCSE: takardun jarrabawar baya, tsarin kimantawa, taswirar tunani, katunan karatu da darussan sauti.
Nazarin Darasi
Barka da kammala darasi akan The Human Nervous System. Yanzu da kuka bincika mahimman raayoyi da raayoyi, lokaci yayi da zaku gwada ilimin ku. Wannan sashe yana ba da ayyuka iri-iri Tambayoyin da aka tsara don ƙarfafa fahimtar ku da kuma taimaka muku auna fahimtar ku game da kayan.
Za ka gamu da haɗe-haɗen nau'ikan tambayoyi, ciki har da tambayoyin zaɓi da yawa, tambayoyin gajeren amsa, da tambayoyin rubutu. Kowace tambaya an ƙirƙira ta da kyau don auna fannoni daban-daban na iliminka da ƙwarewar tunani mai zurfi.
Yi wannan ɓangaren na kimantawa a matsayin wata dama don ƙarfafa fahimtarka kan batun kuma don gano duk wani yanki da kake buƙatar ƙarin karatu. Kada ka yanke ƙauna da duk wani ƙalubale da ka fuskanta; maimakon haka, ka kallesu a matsayin damar haɓaka da ingantawa.
- Which two structures make up the central nervous system? A. The brain and the nerves B. The brain and the spinal cord C. The spinal cord and the nerves D. The receptors and the effectors Answer: B
- Which type of neurone carries impulses from the central nervous system to a muscle? A. Sensory neurone B. Relay neurone C. Motor neurone D. Receptor neurone Answer: C
- What crosses the gap at a synapse? A. An electrical impulse B. A chemical C. A nerve fibre D. A red blood cell Answer: B
- Which of the following is an effector? A. A pain receptor in the skin B. A relay neurone in the spinal cord C. A salivary gland D. The spinal cord Answer: C
- Why is a pain-withdrawal reflex faster than a voluntary movement? A. Its impulses travel at a higher speed B. Its pathway passes through fewer synapses C. It uses hormones instead of neurones D. It does not need an effector Answer: B
Yi aikin wadannan tambayoyi a cikin manhaja
Yi aikin wadannan tambayoyi a cikin manhaja
Littattafan da ake ba da shawarar karantawa
Yi Aikin Tambayoyin Gwaji
Kana son yin aikin tambayoyin gwaji kan The Human Nervous System? Sauke manhajar Green Bridge CBT don samun tambayoyin gwaji da cikakkun jarrabawa akan wannan batu.
Sauke Manhajar Daga Google Playstore
Duk abin da kake buƙata don yin fice a JAMB, WAEC & NECO.
