Which of the following is the property of a cardiac cell to initiate and fire an action potential on its own without external stimulation?

Select one:

a. Spontaneity.

b. Selectivity

c. Rhythmicity

d. Automaticity

e. Conductance.

Expert Solution

d.Automaticity

Automaticity is the unique propoerty of the cardiac cell to initiate and fire an action potential on it's own without an external stimulation.And is greatest at the SA and AV nodes cells.

Sydney Mullin answered 2 years ago

1. Which of the following statements is false? a. The action potential of a cardiac contractile...

1. Which of the following statements is false? a. The action potential of a cardiac contractile cell has a plateau. b. The action potential of a cardiac contractile cell has three phases. c. The action potential of a cardiac contractile cell has a gradual depolarization. d. The action potential of a cardiac contractile cell returns to rest. 2. The electrical axis of the heart corresponds to: a. The conduction of the heart b. The cardiac contractile cell action potential c....

Cardiac muscle cells cannot fire an action potential until the muscle has relaxed from the previous...

Cardiac muscle cells cannot fire an action potential until the muscle has relaxed from the previous beat. From this you know that Select one: a. Ligand-gated sodium channels remain closed until calcium is pumped away from the sarcomeres b. Voltage-gated sodium channels must be inactivated until calcium is pumped away from the sarcomeres. c. Ligand-gated potassium channels remain open until calcium is pumped away from the sarcomeres. d. Voltage-gated potassium channels must not open until calcium is pumped away from...

The heart is said to be automatic. This means that it generates its own action potential...

The heart is said to be automatic. This means that it generates its own action potential and contracts without the need for innervation. The basis for this is that some of its cells show what is called a spontaneous depolarization that moves the membrane potential to threshold. Please give a reasonable explanation in terms of changes of membrane permeability to ions that could explain this spontaneous depolarization termed the pacemaker potential.

Cardiac myocytes (contractile cells) have a prolonged action potential including a plateau phase which lasts up...

Cardiac myocytes (contractile cells) have a prolonged action potential including a plateau phase which lasts up to ~250ms. This is to enable a longer, sustained contraction so that the ventricles have time to pump blood out. In order to enable this ‘plateau’ phase (Phase 2): Group of answer choices Slow Na+ channels enable a sustained inward Na+ current. Slow K+ channels enable a sustained inward K+ current, balance with Na+ efflux. L-type Ca2+ channels enable Ca2+ influx which is balanced...

Compare and contrast cardiac and skeletal muscle in the following: Cellular structure Excitation-Contraction Coupling Action potential...

Compare and contrast cardiac and skeletal muscle in the following: Cellular structure Excitation-Contraction Coupling Action potential of Skeletal Muscle cells and Cardiac Contractile muscle cells Production of ATP Role of Calcium Mechanisms for increased strength/force of contraction

Calculate the cell potential for the galvanic cell in which the following reaction occurs at 25...

Calculate the cell potential for the galvanic cell in which the following reaction occurs at 25 °C, given that [Al3 ] = 0.00120 M and [Au3 ] = 0.787 M. Al (s) + Au^3+ (aq) <===> Al^3+ (aq) + Au (s)

A typical action potential in a neuron is caused by which one of the following processes?...

A typical action potential in a neuron is caused by which one of the following processes? a: a surge in the activity of the Na+/K+ pump b: a large increase in the intracellular concentration of K+ ions c: a large increase in the intracellular concentration of Na+ ions d: a brief increase in Na+ permeability followed by a brief increase in K+ permeability e: a simultaneous increase in the permeability of the membrane to both Na+ and K+ ions e

1. Which of the following DOES NOT influence the conduction velocity of an action potential A)...

1. Which of the following DOES NOT influence the conduction velocity of an action potential A) Diameter of the axon B) Permeability of the axon C) Density of Ca channels D) Myelination (answer not D or A) 2. The relationship of an action potential (AP) to the stimulus that generates it is best described as: A) Stimulus intensity is correlated with the frequency of the AP B) Stimulus intensity is proportional to the amplitude of the AP C) Stimulus intensity...

Each of the following means of physical control, describe the action on the cell, its effect...

Each of the following means of physical control, describe the action on the cell, its effect on the cell (be very specific – what does it do to vital parts or chemicals within the cell), and give a detailed specific example of its use in controlling microbes. I want detail – do a good job or lose points.(5 points) Autoclave Boiling Pasteurization Radiation: both UV light and ionizing radiation Cold (Refrigeration and freezing)

Which of the following would be good evidence that the negative resting potential of a cell...

Which of the following would be good evidence that the negative resting potential of a cell is due to Cl- diffusing in ? (choose all that are correct) - Anoxia causes an immediate large change in the membrane potential - When Cl- channel blockers are applied, the membrane potential goes toward zero - When Cl- concentrations outside the cell are raised, the membrane potential becomes more positive -When Cl- concentrations are raised outside the cell, the membrane potential becomes more...

Question