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Physiology Wk 6
Articulations and Muscle Contraction
| Question | Answer |
|---|---|
| Which of the following is not a function of muscles? a. storage b. posture c. heat production d. movement | a. storage |
| The minimal level of stimulation required to cause a fiber to contract is called the: a. all-or-none principle b. summation c. tetanus d. threshold stimulus | d. threshold stimulus |
| Muscle tone is maintained by: a. positive feedback mechanisms b. negative feedback mechanisms c. both positive and negative feedback mechanisms d. none of the above | b. negative feedback mechanisms |
| The four kinds of protein that make up myofilaments are myosin, actin, a. tropomyosin, and myofibril b. troponin, and myofibril c. troponin, and trypsin d. tropomyosin, and troponin | d. tropomyosin, and troponin |
| Joints joined by fibrocartilage are called a. synchrondroses b. gomphoses c. symphyses d. sutures | c. symphyses |
| The shoulder joint is an example of a ____ joint. a. multiaxial b. freely movable c. ball and socket d. The should joint is an example of all of these | d. The shoulder joint is an example of all of these |
| The muscle's ability to stretch or extend and to return to its resting length is called a. excitability b. irritability c. contractibility d. extensibility | d. extensibility |
| Synovial joints are a. freely movable b. slightly movable c. immovable d. freely moveable and slightly movable | a. freely movable |
| According to the sliding filament theory a. actin moves past myosin b. tropomyosin moves past actin c. troponin moves past myosin | a. actin moves past myosin |
| The structure of the knee joint permits movements of a. flexion and extension b. flexion and circumduction c. extension and circumduction d. none of the above | a. flexion and extension |
| The largest and most commonly injured join in the body is the ____ joint. a. hip b. shoulder c. knee d. elbow | c. knee |
| The energy required for muscular contraction is obtained by hydrolysis of a. DNA b. RNA c. ADP d. ATP | d. ATP |
| 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: a. conducted b. inactivated c. recruited d. retained | c. recruited |
| Which type of movement occurs between the carpal and tarsal bones and between the articular facets of adjoining spinal vertebrae? a. gliding b. rotation c. circumduction d. protraction | a. gliding |
| ____ occurs when the foot is tilted upward, thus decreasing the angle between the top of the foot and the front of the leg. a. Plantar flexion b. Dorsiflexion c. Extension d. Supination | b. Dorsiflexion |
| 3 phases of the twitch contraction are the a. latent period, contraction, and stimulation phase b. latent period, stimulation, and excitement phase c. latent period, contraction, and relaxation phase d. stimulation ,contraction, and relaxation phase | c. latent period, contraction phase, and relaxation phase |
| If a structural classification is used, joints are named according to the type of ___ tissue that joins the bones together. a. epithelial b. adipose c. muscle d. connective | d. connective |
| Synarthrotic joints are a. freely movable b. slightly movable c. immovable d. freely movable and slightly movable | c. immovable |
| Some synovial joints contain a closed pillow-like structure called a(n) a. meniscus b. ligament c. bursa d. articular cartilage | c. bursa |
| The joint present during the growth years between the epiphyses of a long bone and its diaphysis is the a. symphysis b. synchrondrosis c. syndesmoses d. suture | b. synchrondrosis |
| Which structure allows the electrical signals to travel along the sarcolemma and move deeper into the cell? a. myosin b. actin c. transverse tubule d. sarcoplasm | c. transverse tubule |
| Which of the following is an example of an uniaxial joint? a. shoulder joint b. hip joint c. elbow joint d. joint between the carpal and tarsal bones | c. elbow joint |
| The joints between the articulating surfaces of the vertebral processes are classified as what type of joint? a. hinge b. ball and socket c. gliding d. immovable | c. gliding |
| A contraction in which muscle length the muscle remains the same but muscle tension increases is called an a. isometric contraction b. isotonic contraction c. isokinetic contraction d. isometric contraction and an isotonic contraction | a. isometric contraction |
| Anaerobic respiration results in the formation of an incompletely catabolized molecule called a. lactate b. glucose c. myoglobin d. ATP | a. lactate |
| Repeated stimulation of muscle in time lessens its excitability and contractibility and may result in a. tetanus b. summation c. twitch contractoin d. fatigue | d. fatigue |
| Exercise may cause an increase in muscle size called a. atrophy b. hypertrophy c. isometric d. isotonic | b. hypertrophy |
| Which subtype of fibrous joints is found only in the skull? a. suture b. syndesmoses c. gomophoses d. synovial | a. suture |
| Which of the following is not among the structures that characterize synovial joints? a. joint capsule b. articular cartilage c. tendons d. ligaments | c. tendons |
| The contractile unit of a muscle cell is the a. actin b. myosin c. myofibril d. sarcomere | d. sarcomere |
Created by:
mjbrowning