Body Structures & Functions
12th Edition
ISBN: 9781285695495
Author: Scott
Publisher: Cengage
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since the age of 10, you have used glasses for myopia. You have heard about the new types of surgery to correct this condition such that you would no longer need glasses. What types of surgery can you get to correct this condition?
Your optometrist shines a light in your eye and notices your pupil constricts (becomes smaller) in response to the light. She tells you the iris (the colored part of the eye) is a muscle that adjusts the size of the pupil automatically in response to the amount of light entering the eye. Based on this information, which type of muscle do you think forms the iris? a. skeletal b. cardiac c. smooth d. visual
What happens to eye ball in the disorder myopia?
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- The drug Botox prevents wrinkles by preventing muscles from contracting. Specifically, it prevents acetylcholine from being released from the synaptic bulb. Explain how preventing acetylcholine prevents voluntary muscle contraction.arrow_forwardWhat do you mean by tendons?arrow_forwardDuring byperopia: older people can see far object and cannot see near objects easily, while during myopia in younger is opposite; can see near objects not that far ones. Speak about the physiological defect in each one? How to correct each one?arrow_forward
- Repetitive extension of the hand at the wrist and abduction of the hand can lead to lateral epicondylitis. Although sometimes called "tennis elbow". it more often affects individuals who don't play tennis. Based on the name lateral epicondylitis and the action described above, which muscle would most likely have microscopic tears in the tendon?arrow_forwardAfter a vigorous exercise, you may experience cramps in your leg muscles. Why does this happen?arrow_forwardOne Paragraph Discuss how we are able to move our fingersarrow_forward
- Which of the following happens if a person steps on a nail with his right foot?(nervous system question) True or False The right foot is pulled away [Select] The right leg is stretched to support the body [Select] The left leg is stretched to support the body [Select] The flexor muscle in the right thigh contracts and the extensor muscle relaxes [Select] The flexor muscle in the right thigh relaxes and the extensor muscle contractsarrow_forwardFollowing an injury to a nerve, the muscle it supplies with motor nerve fibers may become paralyzed. How would you explain to a patient the importance of moving the disabled muscles passively or contracting them using electrical stimulation?arrow_forwardWhich of the following changes takes place when a skeletal muscle contracts?A. Z discs move farther apart.B. Actin filaments contract.C. Myosin filaments contract.D. Sarcomeres become shorter.arrow_forward
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