Regulation Of Cardiac Activity

Question 1

why is heart called myogenic

Answer 1

normal activities are autoregulated by nodal tissues

Question 2

which centre in brain can moderate the cardiac activity through which nervous system

Answer 2

neural centre in medulla oblongata
through autonomic nervous system

Question 3

how does the neural centre affect cardiac output

Answer 3

increase rate of heart beat and strength of ventricular contraction
therefore, cardiac output increases

Question 4

how is cardiac output decreased then

Answer 4

signals from parasympathetic neural system decrease heart rate, speed of conduction of action potential and therefore cardiac output is decreased

Question 5

harmones from which other sites can also increase cardiac output

Answer 5

adrenal medullary