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Week7-StudyStack

Articulations and Muscle Contraction

QuestionAnswer
1. What are articulations? Points at which bones meet or articulate.
2. What are various ways joints are classified? Include examples 1. Structural classification based on the type of connective tissue, such as fibrous and cartilaginous or presence of synovial 2. Functional classification according to the degree of movement, such as immovable, slightly or freely movable
3. What key structures identify a synovial joint? Joint capsule (sleeve-like casing); synovial membrane (lines the capsule and secrets synovial fluid); Menisci (articular discs between the articulating bones); articular cartilage; and joint cavity.
4.What is the purpose of Range of Motion (ROM) measurement? ROM measurement is used to establish extent of muscle injury
5. Two evidence pieces that support the changes in articulation throughout the cycle of life? 1. The disappearance of fontanels located between cranial bones in infants. 2. Ossification of epiphysial plates at maturity
6. What are the major steps of muscle contraction? Nerve impulse triggers acetylcholine (ACh); ACh binds to ACh receptors; the stimulation initiates impulse that travel along sarcolemma to sacs of sarcoplasmic reticulum (SR); Ca ions bind to troposin; myosin binds actin causing muscle fiber contraction.
7.Where does the energy for muscle contraction comes from? The energy for the muscle contraction comes from the hydrolysis of adenosine triphosphate (ATP)
8. What is a twitch contraction of the muscles? It is an involuntary, quick jerk of the muscle caused by a single, short stimulus.
9. What is physiologic muscle fatigue? What are the causes? A physiologic muscle fatigue reflects a failure in any of the steps of muscle contraction. It can be attributed to failure of Sodium and Potassium Pumps in maintaining ion concentration gradients required to stimulate a contraction or ATP depletion.
10. What is the graded strength principle? The graded strength principle explains that skeletal muscles contract with varying degrees of strength at various times.
Created by: Maaron F
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