Related Essays

  • Sarcomere: An Overview Of The Myocyte

    There are three main types of electrical tissue in the myocardium: ventricle & atria, SA & AV node (pacemaker cells) and Purkinje fibers. Each type of cell d...

  • Anatomy And Physiology Essay Questions

    Cardiac muscle cells and skeletal muscle cells both depolarizing action potentials causes muscle contraction. Depolarization waves travel down the T tubules ...

  • Working Cell Process

    There are five phases of action potential in working cells: during phase 0, fast sodium channel opens allowing sodium ion (Na+)to enter the cell and depolar...

  • Pacemaker Action Potential Research

    An action potential is defined as the change in electrical potential associated with the passage of an impulse along the membrane of a muscle or nerve cell. ...

  • Action Potentials In The Mojave Rattlesnake

    Once the cell begins to hyperpolarize, sodium channels open up and allow sodium ions to flood into the membrane. Once the concentration of sodium ions have b...

  • Cardiac And Skeletal Muscle Similarities

    Moving on to the shape of the two muscles, cardiac muscle has a semi spindle which is in fact shorter and wider than skeletal muscles. Skeletal muscles

  • Action Potential Essay

    When the action potential reaches its peak of 30 millivolts, Na+ channels close. Repolarization begins as K+ voltage gated channels start to open and an effl...

  • What´s Plantar Flexion?

    In order for a skeletal muscle to contract, it has to first be stimulated by a nerve (Harrison, 2006). The muscles contract by a process known as the sliding...

  • Voltage Gated Sodium Channels Case Study

    It is a specific protein presenting on the membrane of the nerve cells and muscle cells. They are responsible for action potential initiation and propagation...

  • Action Potential Lab Report

    I. Introduction Action potentials are generated as a result of a neuron’s membrane reaching a specific threshold. In order to reach this threshold, a cell ...

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off
Reading...
Front

Card Range To Study

through

image

Play button

image

Play button

image

Progress

1/10

Click to flip

Use LEFT and RIGHT arrow keys to navigate between flashcards;

Use UP and DOWN arrow keys to flip the card;

H to show hint;

A reads text to speech;

10 Cards in this Set

  • Front
  • Back
Cardiac and skeletal muscle both contain actin and myosin. TRUE/FALSE
TRUE. They interdigitate and slide closer together during contraction.
Which has a longer action potantial, skeletal or cardiac muscle?
It is very brief in skeletal muscle, in cardiac muscle it is 100 times longer, lasting throughout the contraction..
Cardiac muscle contractions are always brief twitches in skeletal muscle. TRUE/FALSE
TRUE. Contractions resulting from rapid repetitive stimulation cannot summate or fuse to provide a smooth sustained contraction.
Why can the above statement not happen in cardiac muscle?
Because the long refractory period cancels any stimulus that occurs before the heart has a chance to relax. Relaxation is essential so the heart has a chance to fill up with blood.
Is it true that skeletal muscle will contract only if it receives a nerve impulse?
Yes. Cardiac muscle excites itself Nerves that carry impulses to the heart influence the rate and strength of contraction. When these nerves are destroyed, the heart continues to beat. This is not the case with skeletal muscle.
When a Purkinje fiber is isolated, it continues to beat at its own rhythm. TRUE/FALSE
TRUE.
What is diastolic potential?
It is resting potential. This slowly rises to a threshold and initiates an action potential.
What initiates this potential or rise in potential?
It is due to the opening of Na+ channels, which permit positively charged sodium ions to rush into the cell from outside, where they are highly concentrated.
What causes the opening of the sodium channels?
It is caused by membrane depolarization so that a positive feedback(depolarization>opening of Na+>channels>depolarization) is activated.
How is the above different from skeletal muscle?
This is followed by an inactivation of the sodium channels together with an opening of the K+ channels, which are delayed.