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14. Coordination and response

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  1. 14.1 Coordination and response

    1. 14.1.1Electrical impulses travel along

      • State that electrical impulses travel along neurones

    2. 14.1.2Mammalian nervous system

      • Describe the mammalian nervous system in terms of: (a) the central nervous system (CNS) consisting of the brain and the spinal cord (b) the peripheral nervous system (PNS) consisting of the nerves outside of the brain and spinal cord

    3. 14.1.3Role of the nervous system

      • Describe the role of the nervous system as coordination and regulation of body functions

    4. 14.1.4Sensory, relay and motor neurones

      • Identify in diagrams and images sensory, relay and motor neurones

    5. 14.1.5Simple reflex arc in terms

      • Describe a simple reflex arc in terms of: receptor, sensory neurone, relay neurone, motor neurone and effector

    6. 14.1.6Reflex action as a means

      • Describe a reflex action as a means of automatically and rapidly integrating and coordinating stimuli with the responses of effectors (muscles and glands)

    7. 14.1.7Synapse as a junction between two

      • Describe a synapse as a junction between two neurones

    8. 14.1.8Structure of a synapse

      • Describe the structure of a synapse, including the presence of vesicles containing neurotransmitter molecules, the synaptic gap and receptor proteins

    9. 14.1.9Events at a synapse

      • Describe the events at a synapse as: (a) an impulse stimulates the release of neurotransmitter molecules from vesicles into the synaptic gap (b) the neurotransmitter molecules diffuse across the gap (c) neurotransmitter molecules bind with receptor proteins on the next neurone (d) an impulse is then stimulated in the next neurone

    10. 14.1.10Synapses ensure that impulses travel

      • State that synapses ensure that impulses travel in one direction only

  2. 14.2 Sense organs

    1. 14.2.1Sense organs as groups of receptor

      • Describe sense organs as groups of receptor cells responding to specific stimuli: light, sound, touch, temperature and chemicals

    2. 14.2.2Structures of the eye

      • Identify in diagrams and images the structures of the eye, limited to: cornea, iris, pupil, lens, retina, optic nerve and blind spot

    3. 14.2.3Function of each part of the eye

      • Describe the function of each part of the eye, limited to: (a) cornea – refracts light (b) iris – controls how much light enters the pupil (c) lens – focuses light on to the retina (d) retina – contains light receptors, some sensitive to light of different colours (e) optic nerve – carries impulses to the brain

    4. 14.2.4Pupil reflex

      • Explain the pupil reflex, limited to changes in light intensity and pupil diameter

    5. 14.2.5Pupil reflex in terms

      • Explain the pupil reflex in terms of the antagonistic action of circular and radial muscles in the iris

    6. 14.2.6Accommodation to view near and distant

      • Explain accommodation to view near and distant objects in terms of the contraction and relaxation of the ciliary muscles, tension in the suspensory ligaments, shape of the lens and refraction of light

    7. 14.2.7Distribution of rods and cones

      • Describe the distribution of rods and cones in the retina of a human

    8. 14.2.8Function of rods and cones

      • Outline the function of rods and cones, limited to: (a) greater sensitivity of rods for night vision (b) three different kinds of cones, absorbing light of different colours, for colour vision

    9. 14.2.9Position of the fovea and state its

      • Identify in diagrams and images the position of the fovea and state its function

  3. 14.3 Hormones

    1. 14.3.1Hormone as a chemical substance

      • Describe a hormone as a chemical substance, produced by a gland and carried by the blood, which alters the activity of one or more specific target organs

    2. 14.3.2Specific endocrine glands and state

      • Identify in diagrams and images specific endocrine glands and state the hormones they secrete, limited to: (a) adrenal glands and adrenaline (b) pancreas and insulin (c) testes and testosterone (d) ovaries and oestrogen

    3. 14.3.3Adrenaline as the hormone secreted

      • Describe adrenaline as the hormone secreted in ‘fight or flight’ situations and its effects, limited to: (a) increased breathing rate (b) increased heart rate (c) increased pupil diameter

    4. 14.3.4Nervous and hormonal control

      • Compare nervous and hormonal control, limited to speed of action and duration of effect

    5. 14.3.5Glucagon is secreted by the pancreas

      • State that glucagon is secreted by the pancreas

    6. 14.3.6Role of adrenaline in the control

      • Describe the role of adrenaline in the control of metabolic activity, limited to: (a) increasing the blood glucose concentration (b) increasing heart rate

  4. 14.4 Homeostasis

    1. 14.4.1Homeostasis as the maintenance

      • Describe homeostasis as the maintenance of a constant internal environment

    2. 14.4.2Insulin decreases blood glucose

      • State that insulin decreases blood glucose concentration

    3. 14.4.3Concept of homeostatic control

      • Explain the concept of homeostatic control by negative feedback with reference to a set point

    4. 14.4.4Control of blood glucose concentration

      • Describe the control of blood glucose concentration by the liver and the roles of insulin and glucagon

    5. 14.4.5Treatment of Type 1 diabetes

      • Outline the treatment of Type 1 diabetes

    6. 14.4.6Of the skin: hairs, hair erector

      • Identify in diagrams and images of the skin: hairs, hair erector muscles, sweat glands, receptors, sensory neurones, blood vessels and fatty tissue

    7. 14.4.7Maintenance of a constant internal

      • Describe the maintenance of a constant internal body temperature in mammals in terms of: insulation, sweating, shivering and the role of the brain

    8. 14.4.8Maintenance of a constant internal

      • Describe the maintenance of a constant internal body temperature in mammals in terms of vasodilation and vasoconstriction of arterioles supplying skin surface capillaries

  5. 14.5 Tropic responses

    1. 14.5.1Gravitropism as a response in which

      • Describe gravitropism as a response in which parts of a plant grow towards or away from gravity

    2. 14.5.2Phototropism as a response in which

      • Describe phototropism as a response in which parts of a plant grow towards or away from the direction of the light source

    3. 14.5.3Gravitropism and phototropism

      • Investigate and describe gravitropism and phototropism in shoots and roots

    4. 14.5.4Phototropism and gravitropism

      • Explain phototropism and gravitropism of a shoot as examples of the chemical control of plant growth

    5. 14.5.5Role of auxin in controlling shoot

      • Explain the role of auxin in controlling shoot growth, limited to: (a) auxin is made in the shoot tip (b) auxin diffuses through the plant from the shoot tip (c) auxin is unequally distributed in response to light and gravity (d) auxin stimulates cell elongation