Respiratory handout will be posted on Friday

Quiz #4 available through Fridayat 6pm

Assignment #2 due Tuesday by1:40pm! Please print your papersif possible.

Fig. 20.1(TE Art)

Systemiccircuit

Pulmonarycircuit

CO2 O2

O2

artery

vein

vein

artery

Tunica intima

Tunica media

Tunica externa

Tunica intima

Tunica media

Tunica externa

Conducting (large) artery

Distributing (medium) artery

Resistance (small) artery• arterioles• metarterioles

Aneurysm:

• weak point in an artery or heart wall

• common in abdominal aortarenal arteries & brain

Cerebral vascular accident (CVA) = stroke

Fig. 21.4(TE Art)Carotid body

Common carotidartery

Aortic bodyAortic arch

Carotid sinus

Baroreceptors

Baroreceptors

Fig. 16.1(TE Art)

GlossopharyngealNerve (CN IX)

Vagus nerve(CN X)

Baroreceptorssense increasedblood pressure

Heart rate decreases

1. Conducting arteries contract & recoilWith increasing and decreasing pressure

2. Carotid sinusesmeasuring pressure

HighBP

Lower HR

2 ways to maintain constant blood pressure

Sphincters openArteriole

Venule

Precapillarysphincters

Metarteriole

Sphincters closed

Fig. 21.5b

Continuous

Fenestratedsinusoids

pericyte

Endothelial cell

hepatocyte

• Clefts• Tight junctions

• Clefts • Pores

Fig. 21.10(TE Art)Distribution of blood

Pulmonary18%

Veins54%

Systemic70%

Heart12%

Arteries11%

Capillaries5%

Tunica intima

Tunica media

Tunica externa

Tunica intima

Tunica media

Tunica externa

To heart

Contracted skeletalmuscles

Relaxed skeletalmuscles

Valveopen

Valveclosed

Vein

1 capillary bed

Pulmonary trunk (artery)

Pulmonary vein

Fig. 21.12(TE Art)

1 capillary bed

Portal system(2 capillary beds)

hypothalamus

Anterior pituitary

pan

spleen

Gastric veins

Superior Mesenteric V

Hepatic sinusoids

IVCHepatic portal system

Fig. 21.12(TE Art)

1 capillary bed

Portal system(2 capillary beds)

Arteriovenousanastomosis

Arterial anastomosesVenous anastomoses

Internal carotid

Vertebral artery

Cerebrovascular Accident = CVA = stroke

Internal carotid

Basilar

Vertebral Circle of Willis

No fetal circulation……