block 2 lecture 11

Question 1

what is the pacemaker potential?

Answer 1

SAN

Question 2

journey of the electrical stimulation of the heart?

Answer 2

SAN, atria, AVN, bundle of hiss, purkinje fibers, ventricles

Question 3

what are the two cell types in the heart?

Answer 3

myocytes and myocardial

Question 4

what are myocytes connected by?

Answer 4

intercalated discs

Question 5

what rhythm does the SAN have?

Answer 5

autorhythmicity

Question 6

what happens if the SAN cant work?

Answer 6

AVN takes over

Question 7

where is the electrical conduction fastest in the heart?

Answer 7

purkinje fibers

Question 8

what is the SAN innervated by?

Answer 8

parasympathetic and sympathetic nervous system

Question 9

sympathetic system of innervating the heart?

Answer 9

impulse sent down the accelerator nerve and noradrenaline is released

Question 10

what does sympathetic innervation do to the heart?

Answer 10

increases rate and force of contraction

Question 11

how does the parasympathetic innervation of the heart work?

Answer 11

vagus nerve releases acetylcholine

Question 12

what slows the heart down?

Answer 12

beta blockers

Question 13

how does adrenaline work in the heart?

Answer 13

adrenaline acts on beta 1 adrenoceptors by cAMP on the SAN to rate and force

Question 14

what are beta 1 adrenoceptors blocked by?

Answer 14

Propanolol and Atenolol