Exam 3

Question 1

Function of the fibrous skeleton of the heart

Answer 1

Provides structure and attachment points

Separates the electrical signal between chambers

Membranous portion of septa

Question 2

What type of tissue is the fibrous skeleton of the heart

Answer 2

Dense irregular c.t.

Question 3

Valves (general)

Answer 3

C.t. Extensions from fibrous skeleton w/overlying endocardium on both sides

Avascular

Question 4

Layers of the valves

Answer 4

1. Spongiosa
2. Fibrosa
3. Ventricularis

Question 5

What is the SA node

Answer 5

Modified myocardial cells that act as the pacemaker

Question 6

What does the internodal tract do

Answer 6

Connects the SA and AV nodes

Question 7

Three tunics of blood vessels

Answer 7

1. Tunica interna
2. Tunica media
3. Tunica externa

Question 8

Arteries carry

Answer 8

Away from heart

Question 9

Veins carry

Answer 9

To heart

Question 10

How to differentiate arteries

Answer 10

Tunic externa is thinner than tunica media

Question 11

How to differentiate veins

Answer 11

Tunica externa is thicker than tunica media

Question 12

Continuous capillaries

Answer 12

Found in blood brain barrier and are the least leaky

Question 13

Fenestrated capillaries

Answer 13

Found in kidney, sm. Intestine, and endocrine glands

Allow small things to pass

Question 14

Discontinuous capillaries

Answer 14

Found in liver, spleen, bone marrow

Allow large things to pass; most leaky

Question 15

Functions of the lymphatic system

Answer 15

1. Return tissue fluid and proteins to blood
2. Absorb and transport lipids from gut
3. Protection from pathogens