TEST 3 C. 2008spring - PRINTABLE VERSION Test 3 You scored...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
PRINTABLE VERSION Test 3 You scored 94 out of 100 Question 1 Your answer is CORRECT. In twitch summation: a) The muscle fiber is stimulated again before the action potential has returned to resting potential. b) The muscle fiber is stimulated again before the filaments have completely returned to their resting position. c) Stronger muscle contractions occur but stronger action potentials do not occur. d) Both [b] and [c] above e) All of these answers Question 2 Your answer is CORRECT. Which of the following statements regarding skeletal muscle is true: a) Calcium in muscles cells is required for cross-bridges between actin and myosin. b) ATP binds troponin allowing the myosin-binding site on actin to be made available. c) ATP is stored in the sarcoplasmic reticulum. d) Skeletal muscles lack mitochondria e) All of these Question 3 Your answer is CORRECT. With eccentric muscle contractions: a) The development of tension occurs at constant muscle length. b) The muscle lengthens while contracting. c) The muscle shortens while contracting. d) Muscle length and tension vary throughout a range of motion. e) None of these answers. Question 4 Your answer is CORRECT. A motor unit refers to: a) a single motor neuron plus all of the muscle fibers it innervates. b) a single muscle fiber plus all of the motor neurons that innervate it.
Background image of page 1

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

View Full DocumentRight Arrow Icon
c) all of the motor neurons supplying a single muscle. d) a pair of antagonistic muscles. e) a sheet of smooth muscle cells connected by gap junctions. Question 5 Your answer is CORRECT. Which chemical(s) is/are required for contraction of smooth muscle fibers? a) calcium. b) calmodulin. c) phosphate. d) ATP. e) all of these answers. Question 6 Your answer is CORRECT. According to the sliding filament mechanism of muscle contraction, the thin filaments slide towards the M line to shorten the sarcomere. a) True b) False Question 7 Your answer is INCORRECT. Blood returning from the lungs: a) enters the right atrium. b) enters the left atrium c) is poorly oxygenated. d) both [a] and [c] above e) both [b] and [c] above Question 8 Your answer is INCORRECT. The rapid rising phase of the cardiac contractile cells action potential results from the opening of voltage-gated _____ channels in the plasma membrane of the cardiac cell. a) sodium b) potassium c) calcium d) chloride e) magnesium Question 9 Your answer is CORRECT.
Background image of page 2
Which of the following ECG waves represents ventricular depolarization? a) P wave b) QRS complex c) T wave d) PR segment e) ventricular depolarization occurs simultaneously with atrial repolarization and can not be recorded. Question 10 Your answer is CORRECT. Which of the following conditions does not exist during the TP interval? a)
Background image of page 3

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

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/05/2012 for the course CHEM 3321 taught by Professor Bean during the Spring '11 term at American Jewish University.

Page1 / 10

TEST 3 C. 2008spring - PRINTABLE VERSION Test 3 You scored...

This preview shows document pages 1 - 4. Sign up to view the full document.

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