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MEDS 530A Final Exam MC Questions And Correct Answers
Muscle tone is ________. - ANSWER a state of sustained partial contraction Which of the following muscles is used to form a smile - ANSWER Zygomaticus major The sternocleidomastoid muscle inserts on the - ANSWER mastoid process of thetemporal bone
Which of the following muscles does NOT act in plantar flexion? - ANSWER popliteus The quadriceps femoris is composed of three "vastus" muscles and the - ANSWERrectus femoris
Tennis players often complain of pain in the arm, or forearm, that swings the racquet.Which of the following muscles is most likely strained under such conditions? - ANSWER the brachioradialis The _____ extends the great toe - ANSWER extensor hallucis longus What term is used to describe a muscle that assists an agonist by producing a likemovement or by stabilizing a joint over which an agonist acts? - ANSWER a synergist
The ______ helps to keep food between the grinding surfaces of the teeth duringchewing - ANSWER buccinator
The _____ is a synergist of the latissimus dorsi; it extends, medially rotates, and adductsthe humerus. - ANSWER teres major
The most powerful muscle in the body is the ________. - ANSWER quadriceps femoris Which of the following is NOT a member of the hamstrings? - ANSWER gracilis Paralysis of which of the muscled would make an individual unable to flex the knee? -ANSWER hamstring muscles
Which of the following muscles inserts to the posterior calcaneus via the calcanealtendon? - ANSWER the gastrocnemius
In general, a muscle that crosses on the anterior side of a joint produces ________. -ANSWER flexion
A nursing infant develops a powerful sucking muscle that inserts to the muscle whichadults also use for whistling. What is this muscle called? - ANSWER buccinator
At the grocery store a cute, little curly-haired child is standing behind you in line. Youturn around for a moment and she sticks her tongue out at you. Which tongue muscle did she use? - ANSWER genioglossus What is the muscle that provides the major force for producing a specific movementcalled? - ANSWER an agonist (prime mover)
The abnormal protrusion of the small intestine through a weak point in the muscle of theabdominal wall is called a ________. - ANSWER hernia
Which of the following muscles is responsible for causing horizontal wrinkles in theforehead? - ANSWER frontal belly of the epicranius
Which muscle does the following: produces inversion at the ankle joint? - ANSWERtibialis anterior
ACh Troponin, a major protein in thin filaments, is a globular protein with three polypeptidesubunits. Which of the following is NOT a function of the troponin? - ANSWER One subunit binds to potassium ions Which of the following is true about smooth muscle? ANSWER Some smooth musclecells are actually able to divide to increase their numbers
Which of the following characterizes unitary smooth muscle cells? ANSWER They havespontaneous action potentials
If provided with precisely the same amount of ATP which of the three fibre types wouldbe able to contract for longest? ANSWER slow oxidative fibers
The anaerobic metabolic pathway that produces two net ATPs per glucose plus twopyruvic acid molecules is ________. - ANSWER glycolysis
The ability of muscle to shorten forcibly when adequately stimulated is called an________, and distinguishes muscles from others - ANSWER Contractility
The value of recruiting slow oxidative fibers for contraction before recruiting fastoxidative and fast glycolytic fibers may be _______ - ANSWER to enable fine control with delicate contractile force with a small stimulus The contractile units of skeletal muscles are ________. - ANSWER myofibrils What is the role of tropomyosin in skeletal muscles? -ANSWER Tropomyosin serves asan inhibitor of contraction, blocking the myosin binding sites on the actin molecules
Which of the following statements is TRUE? -ANSWER Striated muscle cells are long and
cylindrical with many nuclei Rigor mortis occurs because ________. -ANSWER no ATP is available to release attachedactin and myosin molecules
Although the anatomical parts of muscle work together to give it its characteristics,which of the following proteins listed below would be most associated with characteristics of excitability? - ANSWER elastic (thin) filaments Creatine phosphate functions in the muscle cell by ______ - ANSWER storing energy thatwill be transferred to ADP to resynthesize ATP
The oxygen-binding protein found in muscle cells is ______ - ANSWER myoglobin Isotonic contraction-the muscle _______ - ANS changes in length and moves the "load" During development, embryonic cells will fuse to form muscle fibers. This will result in________. - ANS multinucleated muscle fibers that can extend as long as 30 centimeters
The strongest muscle contractions are normally achieved by ________. - ANS increasingthe stimulation up to the maximal stimulus
What is the most distinctive property of muscle tissue? - ANSWER The ability to convertchemical energy into mechanical energy to move the body
Of the following listed below, which is the best description for why skeletal musclestores glycogen? - ANSWER Skeletal muscle is a high consumer of energy
Curare is a toxic plant extract. Curare molecules have a chemical structure similar tothe neurotransmitter ACh. Curare can bind to the ACh receptor site on the chemically gated ion channels in the motor end plate. Even though curare will bind to the receptor
