Homework Answers
ANSWERS
Q 18 .( option A )- Lactic acid
Q 20 . (option B) - Stores oxygen in muscle cells
Q 21 . (option B) - A state of sustained partial contraction
Q 39 . ( option C) - Multipolar neurons
Q 41 . False
Q 46 . ( option B ) - Acetylcholine
Q 47 . ( option C) - Myelin shealth
Q 48 . (option A) - A fibers
Q 53 . True
Q 55 . (option D) - Frequency of action potentials
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change pas channels in the volta t ive protein to change shape. This A of the...
13. During skeletal musele contraction, whet substance does the sarcoplasmic reticulum store and release? A. acetyicholine...
13. During skeletal musele contraction, whet substance does the sarcoplasmic reticulum store and release? A. acetyicholine B. sodium D. calcium 34. What stimalates the sarcoplasmic reticulum (SR) to release this chemical? A. the voltage change from the muscular action potential traveling down the transverse (1) tubules B. the binding of acetylcholine to ligand-gated channels in the transverse tubules C. direct stimulus from the neural action potential D, the binding of myosin to actin 35. Transverse (T) tubales are extensions of...
B C). F Fotch G I Anind A [Choose) B [Choose ] Acetyl-choline gated sodium channels...
B C). F Fotch G I Anind A [Choose) B [Choose ] Acetyl-choline gated sodium channels open, causing a graded potential on the sarcolemma An action potential moves across the sarcolemma and down the t-tubules An action potential arrives in the muscle cell via gap junctions The calcium ATPase is always active Ca++ is released from the sarcoplasmic reticulum through the opening of voltage gated calcium channels (DHP- Calcium diffuses through the cytosol and binds with troponin Acetylcholine binds with...
Choose best answer 1. The primary movement of ions across the sarcolemma during an action potential...
Choose best answer 1. The primary movement of ions across the sarcolemma during an action potential that stimulates a skeletal muscle fiber to contract is: a. sodium inward and potassium outward b. sodium outward and potassium inward c. both sodium and potassium inward d. both sodium and potassium outward 2. The chemical substance that transmits the electrical impulse from the alpha motor neuron to the sarcolemma of the muscle fiber is: a. norepinephrine b. adrenalin c. beta-endorphin d. acetylcholine 3....
Efer Figure2 to answer questions 18-21: 8. produce the myelin sheaths of neurons in the central F...
efer Figure2 to answer questions 18-21: 8. produce the myelin sheaths of neurons in the central Figure 2 nervous system. 19 form the Blood Brain Barrier 20._ are responsible for neurotransmitter release. 21 have ligand gated ion channels that are activated by neurotransmitters 22. Functionally, which cellular location is the neuron's "decision- making site" as to whether or not an action potential will be initiated? A axonal membrane B. axon hillock C. dendritic membrane D. presynaptic membrane 23. Calcium and...
Neuron Signaling and Muscle Contraction 1) “Dissect” the various parts of an action potential by describing...
Neuron Signaling and Muscle Contraction 1) “Dissect” the various parts of an action potential by describing the status (active or nonactive) of the voltage-gated sodium channel, voltage-gated potassium channel, sodium/potassium pump, and overall voltage and/ or voltage range (in millivolts, or mV) for each of the following. A) Resting membrane (prior to the initiation of an action potential) B) just before threshold to just after threshold (Depolarization) C) Rising phase of the action potential D) Falling phase of the action...
Which of the following statements about skeletal muscle contraction is false? During muscle contraction, the Z...
Which of the following statements about skeletal muscle contraction is false? During muscle contraction, the Z discs move closer together as the myosin heads move toward the plus ends of the actin filaments. The changes in voltage across the plasma membrane that occur when a muscle cell receives a signal from the nervous system causes Ca2+ to flow into the sarcoplasmic reticulum, triggering a muscle contraction. An action potential in the muscle cell plasma membrane leads to voltage-gated calcium channels...
Question 28 4 pts Once the action potential occurs in the sarcolemma, it spreads moving down...
Question 28 4 pts Once the action potential occurs in the sarcolemma, it spreads moving down the T-tubules. What next? What is the correct order of events which result in skeletal muscle contraction? (4 points) a. Once the muscle cell action potential is initiated then calcium ions are released from the sarcoplasmic reticulum. These calcium ions bind to troponin. With this binding, tropomyosin is pulled away from the active sites on actin. Myosin can bind with actin forming a cross...
1. What channels or carriers are NOT found at the axon to the axon terminal? Select...
1. What channels or carriers are NOT found at the axon to the axon terminal? Select one: a. Na+ leaky channels b. Cl- gated channels c. Na+ gated channels d. Na+-K+ ATPase e. None of the above 2. What is TRUE about action potential in the neuron? There may be more than one answer. Select one or more: a. At resting membrane potential (-70mV), the inactivation gate of the Na+ channel is closed while the activation gate is opened. b....
Regarding the neuromuscular junction... a. Depolarization of the presynaptic membrane directly causes voltage-gated calcium channels in...
Regarding the neuromuscular junction... a. Depolarization of the presynaptic membrane directly causes voltage-gated calcium channels in the membrane to open. b. Action potentials in the sarcolemma directly cause calcium channels to open. c. Action potentials in the sarcoplasmic reticulum indirectly cause the calcium ATPase pump to function, if ATP is present. d. both a) and b) are correct, and c) is incorrect e. a), b) and c) are all correct 2) Following ATP hydrolysis by myosin, which steps occur during...
1. True -False. If a statement is True, place a T to the left of it....
1. True -False. If a statement is True, place a T to the left of it. If a statement is False, place an F to the left of it. Thin filaments in smooth muscles attach to Z discs. The majority of ventricular filling occurs during the period of atrial contraction known as the period of rapid filling. Closure of the atrioventricular valves occurs at the end of diastole/beginning of systole. Tetanus in skeletal muscles is the result of increasing the...
13. During skeletal musele contraction, whet substance does the sarcoplasmic reticulum store and release? A. acetyicholine B. sodium D. calcium 34. What stimalates the sarcoplasmic reticulum (SR) to release this chemical? A. the voltage change from the muscular action potential traveling down the transverse (1) tubules B. the binding of acetylcholine to ligand-gated channels in the transverse tubules C. direct stimulus from the neural action potential D, the binding of myosin to actin 35. Transverse (T) tubales are extensions of...
B C). F Fotch G I Anind A [Choose) B [Choose ] Acetyl-choline gated sodium channels open, causing a graded potential on the sarcolemma An action potential moves across the sarcolemma and down the t-tubules An action potential arrives in the muscle cell via gap junctions The calcium ATPase is always active Ca++ is released from the sarcoplasmic reticulum through the opening of voltage gated calcium channels (DHP- Calcium diffuses through the cytosol and binds with troponin Acetylcholine binds with...
efer Figure2 to answer questions 18-21: 8. produce the myelin sheaths of neurons in the central Figure 2 nervous system. 19 form the Blood Brain Barrier 20._ are responsible for neurotransmitter release. 21 have ligand gated ion channels that are activated by neurotransmitters 22. Functionally, which cellular location is the neuron's "decision- making site" as to whether or not an action potential will be initiated? A axonal membrane B. axon hillock C. dendritic membrane D. presynaptic membrane 23. Calcium and...
Which of the following statements about skeletal muscle contraction is false? During muscle contraction, the Z discs move closer together as the myosin heads move toward the plus ends of the actin filaments. The changes in voltage across the plasma membrane that occur when a muscle cell receives a signal from the nervous system causes Ca2+ to flow into the sarcoplasmic reticulum, triggering a muscle contraction. An action potential in the muscle cell plasma membrane leads to voltage-gated calcium channels...
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