Brain Stimulation and MRI Scanning Techniques
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Questions and Answers

What is the main function of the endocrine system in the human body?

  • Control body temperature through sweat production
  • Direct nerve impulses for immediate responses
  • Secrete hormones into the bloodstream for slower, long-term communication (correct)
  • Regulate muscle contractions

    • Which mechanism is activated when the body temperature decreases too much?

  • Skeletal muscles contracting rapidly (shivering) (correct)
  • Sweating from sweat glands
  • Hairs standing on end for better insulation
  • Vasodilation to increase blood flow near the skin surface

    • What role does vasoconstriction play in heat regulation?

  • Decreases heat loss by reducing blood flow near the skin surface (correct)
  • Increases blood flow close to the skin surface
  • Causes sweating to stop
  • Generates heat through rapid muscle contraction

    • How does vasodilation contribute to maintaining body temperature?

    <p>Increases blood flow near the skin surface for more heat loss (B)</p> Signup and view all the answers

    Which communication system in the human body involves chemical messengers?

    <p>Endocrine system (C)</p> Signup and view all the answers

    What happens when sweat evaporates from the skin surface?

    <p>Increased energy transfer away from the body (A)</p> Signup and view all the answers

    What is the purpose of reflexes in the body?

    <p>To coordinate appropriate responses quickly (D)</p> Signup and view all the answers

    What is the function of effectors in the nervous system?

    <p>Executing responses such as muscle contractions (D)</p> Signup and view all the answers

    What is the role of synapses in neural communication?

    <p>Trigger the start of an impulse in the next neuron (B)</p> Signup and view all the answers

    Why does a reflex arc differ from a usual conscious response?

    <p>It allows vital responses to occur quickly (B)</p> Signup and view all the answers

    Which statement accurately describes the journey of an impulse in a reflex arc?

    <p>From sensory neuron to relay neuron to effector (B)</p> Signup and view all the answers

    In neural communication, what triggers the release of a chemical into the synapse?

    <p>Impulse reaching the end of the neuron (D)</p> Signup and view all the answers

    What is the role of electrically stimulating different parts of the brain?

    <p>Providing information on the function of specific brain areas (D)</p> Signup and view all the answers

    Which part of the eye carries impulses from the retina to the brain?

    <p>Optic nerve (C)</p> Signup and view all the answers

    What is the main function of the cornea in the eye?

    <p>To transmit light onto the retina (D)</p> Signup and view all the answers

    What is the purpose of MRI scanning techniques in relation to the brain?

    <p>To show which part of the brain is affected by a tumour (C)</p> Signup and view all the answers

    What happens when light hits the retina of the eye?

    <p>Impulses are sent to the brain (C)</p> Signup and view all the answers

    What structure in the eye is responsible for bending and focusing light onto the retina?

    <p>Cornea (D)</p> Signup and view all the answers

    What happens to the muscles surrounding the pupil in bright light?

    <p>Circular muscles relax and radial muscles contract (A)</p> Signup and view all the answers

    What is the role of ciliary muscles and suspensory ligaments in controlling the shape of the lens?

    <p>Ciliary muscles control the lens shape while suspensory ligaments hold it in place (B)</p> Signup and view all the answers

    What occurs when ciliary muscles contract and suspensory ligaments loosen?

    <p>Lens becomes thicker and more curved (C)</p> Signup and view all the answers

    Which eye defect is characterized by distant objects appearing blurry?

    <p>Myopia (D)</p> Signup and view all the answers

    In dim light, what happens to the circular and radial muscles surrounding the pupil?

    <p>Circular muscles contract and radial muscles relax (D)</p> Signup and view all the answers

    What is the effect of suspensory ligaments tightening and ciliary muscles relaxing on the lens?

    <p>Lens becomes thinner (D)</p> Signup and view all the answers

    What is the primary function of dialysis in treating kidney failure?

    <p>Removing waste products from the blood (A)</p> Signup and view all the answers

    Why is it mentioned that dialysis has to be done three times a week?

    <p>To ensure continuous removal of waste products from the blood (A)</p> Signup and view all the answers

    What are some drawbacks of undergoing dialysis treatment?

    <p>Requirement for strict diet control (A)</p> Signup and view all the answers

    Why is a kidney transplant considered the only cure for kidney failure?

    <p>It addresses the root cause of kidney failure (A)</p> Signup and view all the answers

    How does a kidney transplant differ from dialysis in terms of long-term treatment effects?

    <p>It is more cost-effective than dialysis overall (C)</p> Signup and view all the answers

    What is one significant advantage of having two kidneys instead of only one for human survival?

    <p>Redundancy in case of acute kidney failure (C)</p> Signup and view all the answers

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