The Circulatory System

Matin Khoshnevis

Background • What organ circulates the blood?

• Location and components of this organ?

• Function of circulation?

• Mechanism of circulation?

Background • The heart • Composed of Cardiac Muscle • Heart rate (Hr)

Background • Cardiac Muscle – One of the three major type of muscle in the body – Oxidative – Striated • Highly resistant to fatigue – Mitochondria – Myoglobin

• Pumps blood through the body in a closed system, and that after it supplies nutrients and oxygen to the cells, it returns to the heart. Function

Mechanism • What sets the Hr?

– Pacemaker – Right Atrium – Innervations by Sympathetic/ parasympathetic pathway

• How is the heart rate set?

Mechanism