Histology Guide virtual histology laboratory

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Histology Guide

Chapter 9 - Cardiovascular System

The cardiovascular system transports blood to and from tissues. It consists of a pump (heart), vessels to deliver blood to tissues (arteries), network of vessels to perfuse tissues (capillaries) and vessels to return blood to the heart (veins).

HEART

The heart pumps blood through the blood vessels of the circulatory system.

EM 073 Endocardium

EM 133 Cardiac Muscle

EM 122 Cardiac Muscle

BLOOD VESSELS

Blood vessels transport blood throughout the body. Arteries, arterioles, and capillaries carry blood away from the heart. Veins carry blood from the capillaries back towards the heart.

EM 246 Artery and Vein

EM 176 Muscular Artery

EM 285 Arteriole

CAPILLARIES

Capillaries are the smallest blood vessels in the body. They are responsible for the exchange of gases, nutrients and other substances between blood and tissues.

Continuous Capillaries

Continuous capillaries completely enclose the lumen of the blood vessel. Typically found in muscle, nerve and connective tissue.

EM 213 Capillary

Pericytes are mesenchymal cells with long cytoplasmic processes that partly wrap around continuous capillaries. They are involved in blood flow, blood-brain barrier, angiogenesis and muscle regeneration.

EM 221 Pericyte

EM 220 Pericyte

EM 224 Capillary

Fenestrated Capillaries

Fenestrated capillaries contain numerous small pores (or fenestrations) that make them far more permeable than continuous capillaries. Typically found in in tissues involved in absorption (gastrointestinal tract, kidney and gallbladder) and endocrine glands.

EM 226 Capillary

EM 160 Capillary

EM 235 Kidney

EM 235 Fenestrated Capillary

Sinusoidal Capillaries

Sinusoidal capillaries are larger than other capillaries and have a discontinuous endothelium. This allows easier movement of cells between the blood and tissues. Their found in the liver, lymphoid tisse, endocrine glands, and hematopoietic organs.

EM 299 Adrenal Cortex

EM 300 Bone Marrow

EM 242 Kuppfer Cell