Biology, 24.03.2020 02:36 hollycoleman13
Propagation of an action potential in a skeletal muscle cell links the signal from a motor neuron to contraction of the muscle cell. An action potential in a muscle cell is propagated by the same mechanism as in neurons, the sequential opening and closing of voltage-gated Na+ and K+ channels in the plasma membrane. However, in muscle cells, the topography of the plasma membrane is quite different than in neurons, and this difference is critical to the function of muscle cells?
Which of the following statements correctly describe(s) T tubules and their role in conducting action potentials in muscle cells?
a. T tubules have receptor proteins that bind neurotransmitters released from the synaptic terminal of the motor neuron.
b. T tubules are infoldings of the plasma membrane that encircle the myofibrils and are in contact with the sarcoplasmic reticulum.
c. T tubules lack the voltage-gated Na+ and K+ channels that are present in the plasma membrane.
d. T tubules carry action potentials into the interior of the muscle cell via voltage-gated Na+ and K+ channe
e. T tubules are extensions of the sarcoplasmic reticulum that are in contact with the plasma membrane.
f. Without T tubules, the muscle cell would not be able to contract.
Answers: 3
Biology, 21.06.2019 23:50
Differentiation of cells changes the nucleic information. true false
Answers: 2
Biology, 22.06.2019 00:00
Most of the fossils found in virginia are in the coastal plain, valley, ridge, and appalachian plateau regions, best suggesting that these geographic provinces a) were once covered by seawater. b) are the oldest parts of virginia. c) have a great deal of karst topography. d) have large amounts of sedimentary rock.
Answers: 1
Biology, 22.06.2019 01:50
Which statement best describes lactic acid fermentation? a. lactic acid fermentation is the first step of cellular respiration. o b. lactic acid fermentation is the final step of cellular respiration. re to berate c. in the absence of oxygen, cells release atp by breaking down lactose into glucose. e der lade res o d. in the absence of oxygen, cells release atp by breaking down glucose into lactate. ar
Answers: 1
Biology, 22.06.2019 04:50
How are proteins and nucleic acids related? they both provide energy. they both carry genetic information. the structure of proteins is determined by nucleic acids. the subunits of nucleic acids are also the subunits of proteins.
Answers: 3
Propagation of an action potential in a skeletal muscle cell links the signal from a motor neuron to...
English, 21.02.2021 08:00
Mathematics, 21.02.2021 08:00
Mathematics, 21.02.2021 08:00
Physics, 21.02.2021 08:00
Spanish, 21.02.2021 08:00
Mathematics, 21.02.2021 08:00
Social Studies, 21.02.2021 08:00
Mathematics, 21.02.2021 08:00
Health, 21.02.2021 08:00
Mathematics, 21.02.2021 08:00
Mathematics, 21.02.2021 08:00