The normal activities of the heart are intrinsically regulated, i.e., autoregulated by the specialised muscles, (nodal tissue). Thus, the heart is known as a myogenic heart.
The neurogenic heartbeat is initiated by a nerve impulse, e.g., annelids and most arthropods.
The rate of its formation and conduction is regulated by the following
i. Neural Regulation: In medulla oblongata, a special neural centre is present, which can moderate, the cardiac function thro the Autonomic Nervous System (ANS).
ii. Hormonal Regulation: Adrenaline and noradrenaline hormones secreted by the medulla of adrenal gland has a significant role in regulating heartbeat and thus increasing the cardiac output. The noradrenaline accelerates the heartbeat, while adrenaline does this function at the time of emergency