Muscle_Study_Questions

Muscle_Study_Questions - Muscle Study Questions (select the...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Muscle Study Questions (select the single BEST answer) 1. Which of the following affects transmission at the neuromuscular junction by blocking the neurotransmitter receptor sites on skeletal muscle? A) black widow venom B) curare C) toxin (from Clostridium botulinum ) which causes botulism D) nerve gases and organophosphate insecticides E) all of these 2. When an action potential occurs in the axon terminal of a somatic motor neuron, which of the following normally occurs? A) exocytosis of vesicles of acetylcholine B) an end plate potential in the motor end plate C) an action potential in the muscle fiber membrane D) A and C E) A, B, and C 3. Which of the following remains the same size (does not shorten) when the sarcomere shortens? A) I band B) H zone C) A band D) the I band and the H zone E) the A band and the H zone 4. Transport of Ca ++ into the sarcoplasmic reticulum (SR) __________ ATP. A) requires B) does not require 5. The cross bridges of myosin are A) tropomyosin B) troponin C) heads of the myosin molecules D) actin 6. The sarcomere A) is the unit of skeletal muscle contraction B) extends from one Z line to the next Z line C) both A and B D) neither A nor B 7. The ATP that supplies the energy for the power stroke is broken down to ADP and phosphate ion _____ the power stroke. A) before B) during 8. Skeletal muscle contraction occurs (is "turned on") when __________ binds to _____________. A) ATP, actin B) tropomyosin, actin C) Ca ++ , myosin D) ATP, the SR E) Ca ++ , troponin 9. Select the choice that lists the numbered events below in the proper order . (Some events may be missing.) 1) tropomyosin moved away from the cross bridge binding sites on actin 2) action potential in T tubule 3) release of Ca ++ from the sarcoplasmic reticulum (SR) 4) action potential in sarcolemma A. 4), 2), 3), 1) B. 2), 4), 1), 3) C. 3), 4), 2), 1) D. 4), 3), 2), 1) 10. Rigor mortis occurs because _____________ levels in the skeletal muscle cell decrease and _________ cannot detach from ___________. A) ATP, troponin, tropomyosin B) Ca ++ , myosin, actin C) Ca ++ , troponin, tropomyosin D) ATP, myosin, actin 11. Which of the following is the first (and fastest) source for supplying ATP for skeletal muscle contraction? A) aerobic pathway (Kreb's cycle and the electron transport chain) B) anaerobic pathway (glycolysis) C) creatine phosphate (phosphocreatine) 12. Which of the following produces ATP faster? A) aerobic pathway B) anaerobic pathway C) both A and B: the two pathways produce ATP at the same rate
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
13. Which of the following produces more ATP per molecule of glucose? A) aerobic pathway B) anaerobic pathway C) both A and B: the two pathways produce the same number of ATP per molecule of glucose 14. Anaerobic exercise can cause A) hypertrophy of muscles B) increased activity of glycolytic enzymes C) lactic acid to be produced D) A and B E) A, B, and C 15. Which type of contraction below could pick up (move) a load (weight)? A) isotonic contraction B) isometic contraction
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/18/2008 for the course PSL 250 taught by Professor Denison during the Spring '08 term at Michigan State University.

Page1 / 7

Muscle_Study_Questions - Muscle Study Questions (select the...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online