Circulatory System: Blood Vessels & Circulation

Question 1

General Anatomy of Blood Vessels

• Arteries - ___ from heart
• Veins - ___ to heart
• ___ connect smallest arteries to veins

Answer 1

General Anatomy of Blood Vessels

• Arteries - away from heart
• Veins - back to heart
• Capillaries connect smallest arteries to veins

Question 2

Vessel Wall - Tunica Interna (Tunica Intima)

• lines ___; exposed to ___
• endothelium: ___ ___ epithelium
• ___ permeable barrier
• secretes ___ - stimulate ___ or ___
• normally REPELS ___ ___ and ___
• if nearby tissue inflamed, endothelium produces ___-___ ___ - induce ___ to adhere

Answer 2

Vessel Wall - Tunica Interna (Tunica Intima)

• lines blood vessels; exposed to blood
• endothelium: simple squamous epithelium
• selectively permeable barrier
• secretes chemicals - stimulate dilation or constriction
• normally REPELS blood cells and platelets
• if nearby tissue inflamed, endothelium produces cell-adhesion molecules - induce leukocytes to adhere

Question 3

Vessel Wall - Tunica Media

• ___ layer
• ___ muscle, ___, ___ tissue
• ___ vessels so blood pressure won’t ___ them
• ___: changes in diameter

Answer 3

Vessel Wall - Tunica Media

• middle layer
• smooth muscle, collagen, elastic tissue
• strengthen vessels so blood pressure won’t rupture them
• vasomotion: changes in diameter

Question 4

Vessel Wall -Tunica Externa (Tunica Adventitia)

• ___ layer
• ___ ___ tisssue, often merges with connective tissue of neighboring ___, ___
• achors ___ ___, but allows passage for small ___, ___ vessels
• ___ ___: small vessels that supply blood to ___ half of larger vessels

Answer 4

Vessel Wall -Tunica Externa (Tunica Adventitia)

• outermost layer
• loose connective tisssue, often merges with connective tissue of neighboring blood vessels, nerves
• achors blood vessels, but allows passage for small nerves, lymphatic vessels
• vasa vasorum: small vessels that supply blood to outer half of larger vessels

Question 5

Arteries

• Arteries (___ vessels) – ___, resilient; resists high blood pressure
• 1) Conducting (elastic / large) arteries
• Ex. - Aorta, brachiocephalic, common carotid,
• subclavian, pulmonary trunk • expand during systole,
• recoil during diastole • elastin in tunica media

Answer 5

Arteries

• Arteries (resistance vessels) – strong, resilient; resists high blood pressure
  1) Conducting (elastic / large) arteries
  • Ex. - Aorta, brachiocephalic, common carotid,
  subclavian, pulmonary trunk • expand during systole,
  recoil during diastole • elastin in tunica media