When the normal heart of a man is injected with a physiological concentration of adrenaline, it shows:

Cardiac activities of the heart are regulated by:
$A.$ Nodal tissue
$B.$ $A$ special neural centre in the medulla oblongata
$C.$ Adrenal medullary hormones
$D.$ Adrenal cortical hormones
Choose the correct answer from the options given below:

An increase in blood flow to the atria of the heart can cause the release of ............ and it causes ............ in blood vessels.

When a normal heart is injected with a physiological concentration of adrenaline,it shows:

When a normal man's heart is injected with a physiological concentration of adrenaline,it causes:

Read the following statements:
$I$ - Increased heart rate.
$II$ - Increased ventricular contraction force.
$III$ - Decreased cardiac efficiency.
$IV$ - Increased cardiac efficiency.
$V$ - Decreased heart rate.
$VI$ - Decreased conduction speed of action potential.
Categorize the given statements into Sympathetic and Parasympathetic nervous systems.
Sympathetic Nervous System $\quad$ Parasympathetic Nervous System