questions

• What is the role of ciliary muscles in the eye?

  Ciliary muscles control the shape of the lens.
• What part of the eye is responsible for focusing light?

  The lens is responsible for focusing light onto the retina.
• What is a reflex action?

  A reflex action is an automatic response to a stimulus.
• What happens when a woman touches a hot object?

  She moves her hand rapidly away due to a reflex action.
• How does the nervous system coordinate a reflex action?

  The nervous system coordinates a reflex action through a series of neurons.
• What detects a stimulus in the skin?

  Receptors in the skin detect a stimulus.
• What is the pathway of an electrical impulse during a reflex action?

  The impulse travels from the sensory neuron to the CNS, then to the motor neuron.
• What is a synapse?

  A synapse is a junction between neurons.
• How is information passed across a synapse?

  Chemicals are released from one neuron and pass to another neuron.
• What is the role of the brain in processing visual information?

  The brain processes visual information received from the retina.
• How does the eye adjust to focus on near objects?

  The ciliary muscles contract, and the suspensory ligaments loosen.
• Why do long-sighted people struggle to see near objects clearly?

  Long-sighted people struggle because their lenses do not bend light rays sufficiently.
• What is the function of effectors in the nervous system?

  Effectors make responses to stimuli.
• What is the difference between receptors and effectors?

  Receptors detect changes in the environment, while effectors make responses.
• What happens to light rays when they hit the retina?

  Light rays focus on the retina to form a clear image.
• How does the brain process visual information from the eye?

  The brain processes visual information by interpreting signals from the retina.
• What is the role of the suspensory ligaments in the eye?

  The suspensory ligaments hold the lens in place and help adjust its shape.
• What is the function of the retina in the eye?

  The retina detects light and converts it into electrical signals for the brain.
• What is the role of the optic nerve?

  The optic nerve transmits visual information from the retina to the brain.
• How do the ciliary muscles and suspensory ligaments work together?

  Ciliary muscles contract or relax to change the tension on the suspensory ligaments, adjusting the lens shape.
• What is the significance of the reflex arc in the nervous system?

  The reflex arc allows for quick responses to stimuli without involving the brain directly.
• What happens to the lens when focusing on distant objects?

  The lens becomes thinner to focus light from distant objects.
• What is the primary function of the pupil?

  The pupil regulates the amount of light entering the eye.
• How does the eye adapt to different lighting conditions?

  The eye adapts by adjusting the size of the pupil and the sensitivity of the retina.
• What is the relationship between the lens shape and vision clarity?

  The shape of the lens directly affects the clarity of the image formed on the retina.
• What is the role of the brain in reflex actions?

  The brain processes the information but does not directly control the reflex action.
• What is the function of the cornea?

  The cornea helps to focus light as it enters the eye.
• How does the eye perceive color?

  The eye perceives color through specialized receptors in the retina called cones.
• What is the impact of aging on vision?

  Aging can lead to changes in lens flexibility and clarity, affecting vision.
• What is the role of the vitreous humor in the eye?

  The vitreous humor maintains the shape of the eye and provides a pathway for light to reach the retina.
• What is the function of the sclera?

  The sclera provides structure and protection to the eye.
• How do tears protect the eye?

  Tears provide lubrication and contain enzymes that protect against infection.
• What is the significance of the fovea in vision?

  The fovea is responsible for sharp central vision and is densely packed with cones.
• How does the eye adjust to focus on objects at varying distances?

  The eye adjusts by changing the shape of the lens through the action of ciliary muscles.
• What is the role of the optic chiasm?

  The optic chiasm is where the optic nerves cross, allowing visual information from both eyes to be processed together.
• What is the function of the macula in the eye?

  The macula is responsible for central vision and high acuity vision.
• How do visual signals travel from the retina to the brain?

  Visual signals travel from the retina through the optic nerve to the brain.
• What is the role of the choroid in the eye?

  The choroid provides nourishment to the retina and absorbs excess light.
• What is the function of the lens in the eye?

  The lens focuses light onto the retina to form clear images.
• How does the eye perceive depth?

  The eye perceives depth through binocular vision and the brain's interpretation of visual cues.