Co-ordination And Response
Muhtasari
Your body is constantly responding to changes both inside and outside it. When you step on something sharp, your foot lifts before you even feel pain. When your blood sugar rises after a meal, hormones bring it back down. Even a plant bending toward a window is co-ordinating a response. All of these examples depend on detecting a stimulus and producing an appropriate response.
In this lesson you will explore how the nervous and hormonal systems work, how the eye and reflex arcs function, how plants respond to light and gravity, and how the body maintains a stable internal environment through homeostasis. This is one of the broadest topics in the Edexcel specification and appears regularly on both papers.
Malengo
- Understand how organisms are able to respond to changes in their environment
- Understand that homeostasis is the maintenance of a constant internal environment, and that body water content and body temperature are both examples of homeostasis
- Understand that a co-ordinated response requires a stimulus, a receptor and an effector
- Understand that plants respond to stimuli
- Describe the geotropic and phototropic responses of roots and stems
- Understand the role of auxin in the phototropic response of stems
- Describe how nervous and hormonal communication control responses and understand the differences between the two systems
- Understand that the central nervous system consists of the brain and spinal cord and is linked to sense organs by nerves
- Understand that stimulation of receptors in the sense organs sends electrical impulses along nerves into and out of the central nervous system, resulting in rapid responses
- Understand the role of neurotransmitters at synapses
- Describe the structure and functioning of a simple reflex arc illustrated by the withdrawal of a finger from a hot object
- Describe the structure and function of the eye as a receptor
- Understand the function of the eye in focusing on near and distant objects, and in responding to changes in light intensity
- Describe the role of the skin in temperature regulation, with reference to sweating, vasoconstriction and vasodilation
- Understand the sources, roles and effects of the following hormones: adrenaline, insulin, testosterone, progesterone and oestrogen
- Understand the sources, roles and effects of the following hormones: ADH, FSH and LH
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Maelezo ya Somo
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Tathmini ya Somo
Hongera kwa kukamilisha somo la Co-ordination And Response. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.
Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.
Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.
- In a reflex arc, which neurone connects the sensory neurone to the motor neurone? A) Effector neurone B) Relay neurone C) Receptor neurone D) Connector neurone Answer: B
- Which hormone lowers blood glucose levels? A) Glucagon B) Adrenaline C) Insulin D) ADH Answer: C
- When looking at a near object, the ciliary muscles: A) Relax, making the lens thin B) Contract, making the lens fat C) Relax, making the lens fat D) Contract, making the lens thin Answer: B
- What is the role of auxin in phototropism? A) It kills cells on the lit side B) It accumulates on the shaded side, causing those cells to elongate more C) It accumulates on the lit side, causing those cells to elongate more D) It prevents growth on both sides Answer: B
- Vasodilation helps the body to: A) Conserve heat B) Lose heat C) Absorb more oxygen D) Digest food faster Answer: B
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Vitabu Vinavyopendekezwa
Jifunze zaidi kutoka vyanzo huria
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Sehemu ya kitabu
Plant Sensory Systems and Responses
Describe how red and blue light affect plant growth and metabolic activities
"Biology: Plant Sensory Systems and Responses" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/biology/pages/30-6-plant-sensory-systems-and-responses. Access for free at https://openstax.org/books/biology/pages/1-introduction
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Sehemu ya kitabu
The Central Nervous System
Identify the spinal cord, cerebral lobes, and other brain areas on a diagram of the brain
"Biology: The Central Nervous System" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/biology/pages/35-3-the-central-nervous-system. Access for free at https://openstax.org/books/biology/pages/1-introduction
Vimechapishwa na mashirika mengine chini ya leseni huria na vinatajwa kama wanavyoomba. Viungo hufungua tovuti zao.
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