The resting membrane potential of cardiac muscle cells (the contractile cells) is approximately -90 mV. The...
The resting membrane potential of cardiac muscle cells (the contractile cells) is approximately -90 mV. The resting membrane potential of typical neurons is approximately -60 to -70 mV. Why is the resting potential of cardiac muscle cells lower than that of a typical neuron?
Homework Answers
The resting potential of cardiac muscle cells is lower than that of a typical neuron because the neurons are excitable cells and they help in transferring the signals from one cell to another. When the neuron is at its resting membrane potential, the area outside the neuron has more Na+ ions and the inside have more K+ ions. Due to this, it tends to have net negative charge inside the cell and hence due to this it triggers the action potential. As the inside of the neuronal cells is much lower than that of the cardiac muscle cell, it tends to have a higher resting membrane potential.
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The resting membrane potential of cardiac muscle cells (the
contractile cells) is approximately -90 mV. The...
A neuron has a resting membrane potential of -70 mV; it’s trigger threshold for firing an...
A neuron has a resting membrane potential of -70 mV; it’s trigger threshold for firing an action potential is -50 mV. Two competing signals arrive simultaneously in the trigger zone: one is a depolarizing stimulus of +40 mV, the other a hyperpolarizing stimulus of -25 mV. Will the neuron fire an action potential after integrating these signals? Why?
All mammalian cells maintain the resting membrane potential across the plasma membrane. Neurons and muscle cells...
All mammalian cells maintain the resting membrane potential across the plasma membrane. Neurons and muscle cells are capable of generating the action potential to communicate with each other. Below is a diagram showing a temporal change of the membrane potential in axon. Explain how such membrane potential is generated and/or maintained in each stage (1-3). Make sure to identify key membrane proteins and the movement of ion(s) through these membrane proteins in each stage. Calculate the membrane potential at the...
The neuron has a resting potential of – 60 mv and a threshold potential at -40...
The neuron has a resting potential of – 60 mv and a threshold
potential at -40 mv. The ENa is approximately at +40 mv. In every
case, the stimulus is initiated at 2 ms, and lasts for 1 ms. Draw
the membrane potentials from 0 to 10 ms for the following scenarios
in each of the boxes above.
a) 15 mv depolarizing stimulus
b) 25 mv hyperpolarizing stimulus
c) 30 mv depolaring stimulus
d) 30 mv depolarizing stimulus after the...
7. Electrical and contractile events of muscle are related, and their timing is sequential. Explain these...
7. Electrical and contractile events of muscle are related, and their timing is sequential. Explain these pictures - what happens during the lag? Twitch Omv- action potential Skeletal -90 mV contraction cardiac - relaxation phase contraction phase delay Action potential teau phase Muscle contraction Muscle contraction MV or muscle contraction MV or musde contraction 100 300 100 200 200 Time (ma) Time (ma)
The resting membrane potential of a neuronal axon is -70 mV. When an action potential is...
The resting membrane potential of a neuronal axon is -70 mV. When an action potential is triggered, Na+ ions move into the axon, which reverses the voltage, bringing it towards 0 mV. Which of the following is the correct term for this sequence of events? a. Repolarization b. Hyperpolarization c. Depolarization d. Hypopolarization e. Isopolarization
Complete each sentence to demonstrate your understanding of the resting membrane potential. Thank you!! Complete each...
Complete each sentence to demonstrate your understanding of the
resting membrane potential.
Thank you!!
Complete each sentence to demonstrate your understanding of the resting membrane potential. opposite The resting membrane potential of a typical neuron is mv. equilibrium potential At rest, the establishes and maintains the concentration gradients for these ions across the plasma membrane When the membrane potential is at the equilibrium potential for a particular ion, there is of the ion through open ion channels, but no Na...
All cells have a membrane potential but only excitable cells like neurons or muscle cells can...
All cells have a membrane potential but only excitable cells like neurons or muscle cells can functionally respond to changes in voltage. True False
Human Physiology! Please help. Case Study: Mrs. Nguyen has high blood pressure. Her physician puts her...
Human Physiology! Please help.
Case Study: Mrs. Nguyen has high blood pressure. Her physician puts her on a medication that increases her urine flow rate (a diuretic) to help reduce her blood pressure. A side effect of this medication is that her plasma (ECF)K concentration drops from 4mM to 2.5 mM. 1. Using just the values for Na" and K' and assuming that her neurons are 25 times more permeable to potassium than to sodium, what is her neuron membrane...
For a neuron with an initial membrane potential at -70 mV, an increase in the movement...
For a neuron with an initial membrane potential at -70 mV, an increase in the movement of potassium ions out of that neuron's cytoplasm would result in
Case Study: concentration drops from 4mM to 2.5 mM. e her blood pressure. A side effect...
Case Study: concentration drops from 4mM to 2.5 mM. e her blood pressure. A side effect of this medication is that her plasma (EC) re. Her physician puts her on a medication that increases her urine fhowate sing just the values for Na' and K: and assuming that her neurons are 25 times mor potassium than to sodium, what is her neuron membrane potential (v e permeable to mpare that to a normal neuron resting membrane potential. Are her cells...
All mammalian cells maintain the resting membrane potential across the plasma membrane. Neurons and muscle cells are capable of generating the action potential to communicate with each other. Below is a diagram showing a temporal change of the membrane potential in axon. Explain how such membrane potential is generated and/or maintained in each stage (1-3). Make sure to identify key membrane proteins and the movement of ion(s) through these membrane proteins in each stage. Calculate the membrane potential at the...
The neuron has a resting potential of – 60 mv and a threshold
potential at -40 mv. The ENa is approximately at +40 mv. In every
case, the stimulus is initiated at 2 ms, and lasts for 1 ms. Draw
the membrane potentials from 0 to 10 ms for the following scenarios
in each of the boxes above.
a) 15 mv depolarizing stimulus
b) 25 mv hyperpolarizing stimulus
c) 30 mv depolaring stimulus
d) 30 mv depolarizing stimulus after the...
7. Electrical and contractile events of muscle are related, and their timing is sequential. Explain these pictures - what happens during the lag? Twitch Omv- action potential Skeletal -90 mV contraction cardiac - relaxation phase contraction phase delay Action potential teau phase Muscle contraction Muscle contraction MV or muscle contraction MV or musde contraction 100 300 100 200 200 Time (ma) Time (ma)
Complete each sentence to demonstrate your understanding of the
resting membrane potential.
Thank you!!
Complete each sentence to demonstrate your understanding of the resting membrane potential. opposite The resting membrane potential of a typical neuron is mv. equilibrium potential At rest, the establishes and maintains the concentration gradients for these ions across the plasma membrane When the membrane potential is at the equilibrium potential for a particular ion, there is of the ion through open ion channels, but no Na...
Human Physiology! Please help.
Case Study: Mrs. Nguyen has high blood pressure. Her physician puts her on a medication that increases her urine flow rate (a diuretic) to help reduce her blood pressure. A side effect of this medication is that her plasma (ECF)K concentration drops from 4mM to 2.5 mM. 1. Using just the values for Na" and K' and assuming that her neurons are 25 times more permeable to potassium than to sodium, what is her neuron membrane...
Case Study: concentration drops from 4mM to 2.5 mM. e her blood pressure. A side effect of this medication is that her plasma (EC) re. Her physician puts her on a medication that increases her urine fhowate sing just the values for Na' and K: and assuming that her neurons are 25 times mor potassium than to sodium, what is her neuron membrane potential (v e permeable to mpare that to a normal neuron resting membrane potential. Are her cells...
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