The Heart and Vascular Network of the Circulatory System

In this chapter, we will include a discussion of muscular effectors that are involved with the circulatory or cardiovascular system. Chapter 3 provided an overview of this organ system, along with a summary equation for it. [Study suggestion: Go back to Chapter 3 and take a quick look at its brief overview of the circulatory system.] We will now re-sketch this overview in considerably more detail, so that it includes the names of the major types of blood vessels (see Figure 11.1).

Organ System 1

VEIN

VENULES

Away from heart Blood flow

VEIN

VENULES

ARTERY

ARTERIOLES

ARTERY

ARTERIOLES

CAPILLARY NETWORK TISSUE CELLS

Fig. 11.1 The heart and vascular network of the circulatory system.

The summary equation from Chapter 3 is also considerably expanded to read as follows:

Organ System 1

CIRCULATORY - THE HEART + VASCULAR + BLOOD (CARDIOVASCULAR) ORGAN NETWORK CONNECTIVE SYSTEM TISSUE

This organ system traces a ''little circle" (circuĂ­) that both begins and ends with the same organ - the ''heart'' or cardium (KAR-dee-um). The circular pattern is created by the ''little vessels'' (vascuĂ­), which first leave the heart, then curve back and eventually return to it - boomerang, anyone? This very impressive, Biologically Ordered anatomy can be called a vascular (VAS-kyoo-lar) network. It does ''involve or pertain to'' (-ar) a bunch of interconnected ''little vessels'' (vascul), doesn't it?

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