BIOS255 EXAM 2
1. Characteristics of Elastic ar- -largest arteries by diameter
teries(Conducting arteries) -contain more elastic fibers than smooth muscle
-conduct blood from the heart to the more distant muscular
arteries
-pressure reservoirs
2. Muscular arteries(distribut- -Distribute blood to various parts of the body
ing arteries) -Contain large amounts of smooth muscle, most named arteries
in the body fall into this category
3. Characteristics of Arterioles -smallest arteries by diameter
-deliver blood to the capillaries, where gas and nutrient ex-
change can occur
-Control amount of blood to various organs
4. Characteristics of Venules -smallest veins
-collect blood from the capillaries
-contain venous valves which prevent the backward flow of
blood
-attached to capillary bed
5. Characteristics of Veins -contain valves
-Carry blood back to heart
-hold the most blood(blood reservoirs)
-rely on the following to return blood to the heart: vasoconstric-
tion, valves, skeletal muscle pump, respiratory pump, and cardiac
suction
-thinner tunica interna and media; thicker externa
6. lymphatic system functions -Immunity
-Lymph formation
-Fluid balance
-Transport lipids
, BIOS255 EXAM 2
7. List the organs of the lym- Lymphatic organs - Non-moving structures that work to house
phatic system lymphatic tissue
Primary:
-Red bone marrow
-Thymus
Secondary:
-Lymph nodes
-Tonsils
-Spleen
8. Describe Red bone marrow -involved in hematopoiesis (blood formation) and immunity
-Soft, loosely organized, highly vascular material
-B-cell maturation
9. Describe the Lymph nodes -most numerous lymphatic organs
-removes unwanted waste
-acts as a site of B-cells and T-cells activation
10. Describe the Tonsils -found in pharynx
-helps to trap inhaled or ingested foreign substances
-Pharyngeal tonsils
-Palatine tonsils
-Lingual tonsils
11. Describe the Thymus -superior to the mediastinum between the two lungs, deep to
the sternum
-site of T-cell maturation and growth
-shrinks as we age and is replaced with adipose tissue
-produces hormones that help to mature the T-cell Lymphocytes
12. Describe the Spleen -largest lymphatic tissue in the body
-phagocytosis of bacteria and old RBCs; acts as a blood reservoir
1. Characteristics of Elastic ar- -largest arteries by diameter
teries(Conducting arteries) -contain more elastic fibers than smooth muscle
-conduct blood from the heart to the more distant muscular
arteries
-pressure reservoirs
2. Muscular arteries(distribut- -Distribute blood to various parts of the body
ing arteries) -Contain large amounts of smooth muscle, most named arteries
in the body fall into this category
3. Characteristics of Arterioles -smallest arteries by diameter
-deliver blood to the capillaries, where gas and nutrient ex-
change can occur
-Control amount of blood to various organs
4. Characteristics of Venules -smallest veins
-collect blood from the capillaries
-contain venous valves which prevent the backward flow of
blood
-attached to capillary bed
5. Characteristics of Veins -contain valves
-Carry blood back to heart
-hold the most blood(blood reservoirs)
-rely on the following to return blood to the heart: vasoconstric-
tion, valves, skeletal muscle pump, respiratory pump, and cardiac
suction
-thinner tunica interna and media; thicker externa
6. lymphatic system functions -Immunity
-Lymph formation
-Fluid balance
-Transport lipids
, BIOS255 EXAM 2
7. List the organs of the lym- Lymphatic organs - Non-moving structures that work to house
phatic system lymphatic tissue
Primary:
-Red bone marrow
-Thymus
Secondary:
-Lymph nodes
-Tonsils
-Spleen
8. Describe Red bone marrow -involved in hematopoiesis (blood formation) and immunity
-Soft, loosely organized, highly vascular material
-B-cell maturation
9. Describe the Lymph nodes -most numerous lymphatic organs
-removes unwanted waste
-acts as a site of B-cells and T-cells activation
10. Describe the Tonsils -found in pharynx
-helps to trap inhaled or ingested foreign substances
-Pharyngeal tonsils
-Palatine tonsils
-Lingual tonsils
11. Describe the Thymus -superior to the mediastinum between the two lungs, deep to
the sternum
-site of T-cell maturation and growth
-shrinks as we age and is replaced with adipose tissue
-produces hormones that help to mature the T-cell Lymphocytes
12. Describe the Spleen -largest lymphatic tissue in the body
-phagocytosis of bacteria and old RBCs; acts as a blood reservoir
