Circulatory System

Question 1

circulatory system after birth

Answer 1

• lungs expand with air and rhythmic breathing begins
• resistance in pulmonary blood vessels decrease, causing an increase in blood flow through the lungs
• foramen ovale closes
• ductus arteriosus constricts and later closes permanently
• ductus venosus degenerates completely closing 3 months after birth
• begins to produce adult hemoglobin
• pressure in inferior vena cava and right atrium decreases
• pressure in left atrium increases

Question 2

arterial end of capillary bed

Answer 2

• hydrostatic pressure is greater than osmotic pressure

- fluid flows out of capillaries

Question 3

venule end of capillary bed

Answer 3

• osmotic pressure is greater than hydrostatic pressure

- fluid flows into the capillaries (osmosis)

Question 4

lymph nodes

Answer 4

• swelling along lymph vessels

- contain phagocytic cells (leukocytes) that filter the lymph, removing and destroying foreign particles and pathogens

Question 5

liver breaks down hemoglobin

Answer 5

uses the components to produced bile salts

Question 6

lymphatic fluid

Answer 6

absorbed fat and fat soluble vitamins

Question 7

hemoglobin

Answer 7

• found in red blood cells
• carries oxygen
• has a higher affinity for carbon monoxide