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Physiology Activity
Week 6
| Question | Answer |
|---|---|
| Some synovial joints contain a closed pillow-like structure called a(n) | bursa |
| Synovial joints are | freely movable |
| The four kinds of protein that make up myofilaments are myosin, actin, | tropomyosin, and troponin. |
| The minimal level of stimulation required to cause a fiber to contract is called the | threshold stimulus |
| The energy required for muscular contraction is obtained by hydrolysis of | ATP |
| According to the sliding filament theory | actin moves past myosin |
| The largest and most commonly injured joint in the body is the _____ joint. | knee |
| If a structural classification is used, joints are named according to the type of _____ tissue that joins the bones together. | connective |
| Exercise may cause an increase in muscle size called | hypertrophy |
| Three phases of the twitch contraction are the | latent period, contraction phase, and relaxation phase. |
| The shoulder joint is an example of a _____ joint. | The shoulder joint is an example of all of these. |
| Joints joined by fibrocartilage are called | symphyses |
| Which of the following is not a function of muscles? | storage |
| Muscle tone is maintained by | negative feedback mechanisms |
| The more muscle fibers contracting at the same time, the stronger the contraction of the entire muscle. The number of muscle fibers contracting depends on how many motor units are | recruited |
| Which subtype of fibrous joints is found only in the skull? | suture |
| The joints between the articulating surfaces of the vertebral processes are classified as what type of joint? | gliding |
| The joint present during the growth years between the epiphyses of a long bone and its diaphysis is the | synchondrosis |
| Synarthrotic joints are | immovable |
| Which of the following is an example of a uniaxial joint? | elbow |
| Which of the following is not among the structures that characterize synovial joints? | tendons |
| The muscle’s ability to stretch or extend and to return to its resting length is called | extensibility |
| Which structure allows the electrical signals to travel along the sarcolemma and move deeper into the cell? | transverse tubule |
| Which type of movement occurs between the carpal and tarsal bones and between the articular facets of adjoining spinal vertebrae? | gliding |
| _____ occurs when the foot is tilted upward, thus decreasing the angle between the top of the foot and the front of the leg. | dorsiflexion |
| The contractile unit of a muscle cell is the | sarcomere |
| A contraction in which muscle length remains the same but muscle tension increases is called an | isometric contraction |
| Repeated stimulation of muscle in time lessens its excitability and contractibility and may result in | fatigue |
| The structure of the knee joint permits movements of | flexion and extension |
| Anaerobic respiration results in the formation of an incompletely catabolized molecule called | lactate |
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Janelleu4771
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