Lecture 2

Question 1

Cardiac Muscle features

Answer 1

• striated
• electrically excitable
• joined to other cardiac muscle cells
• contains:
  
  • actin
  • myosin
  • sarcoplasmic reticulum
  • t-tubule system
    myofibrils act as the contractile component and makes up most of the muscle tissue

Question 2

Gap Junction

Answer 2

electrically linked sites that allow ions to move between the cells and transfer action potentials

Question 3

Desmosomes

Answer 3

Structures that anchor cells together

Question 4

Intercalated discs

Answer 4

adjacent cardiac cells that are interlocked

Question 5

Auto rhythmicity

Answer 5

The hearts ability to generate its own action potentials, these make up about 1% of the heart cells
the majority of heart cells are contractile cells

Question 6

Nernst Potential Equation

Answer 6

Calculates the membrane potential based on the equilibrium potential for potassium

Question 7

Goldman-Hodgkin-Katz Equation

Answer 7

Calculates resting membrane potential taking into account all of the ions that move across the membrane