BIO201 Graded Exam 3 Topic 12: Spinal Cord, Spindal Nerves, Brain and Cranial Nerves FALL 2023

Which of the following situations occurs in electrically excitable cells? Select one: a. The sodium-potassium pump moves sodium into the cell. b. The opening and closing of ligand-gated channels cause depolarization. c. Sodium ion channels are opened by high extracellular calcium levels. d. When Na ion channels open, K ion channels close. e. Depolarization causes voltage-gated sodium ion channels to open. + + My Account Question 2 Correct 5.00 points out of 5.00 Question 3 Correct 5.00 points out of 5.00 What does "D" represent on the diagram? Select one: a. Actin myofilament b. Myosin myofilament c. Cross-bridge d. Z disk e. Sarcomere A patient has a broken arm and must wear a cast for a prolonged period of time. Which of the following is mostly likely to be true when the cast is removed? Select one: a. The patient's arm muscles will have undergone atrophy. b. The patient's arm muscles will have undergone hypertrophy. c. The patient's arm muscles will look the same as they did before the break. Question 4 Correct 5.00 points out of 5.00 Question 5 Correct 5.00 points out of 5.00 A proper definition of muscle tone is Select one: a. constant tension produced by muscles for long periods of time. b. warm-up of muscle tissue. c. a feeling of well-being following exercise. d. muscles contracting together. e. the ability of a muscle to maintain a contraction against an outside force. Which of the following is mismatched? Select one: a. I band – contains only actin b. Myosin myofilaments – thin myofilaments c. Z disk – structure between adjacent sarcomeres d. Actin myofilaments – thin myofilaments e. M line – middle of the H zone