PMLS prelims week 4 and 5

▪ O2 rich blood

▪ CO2 poor blood

- Returns the deoxygenated blood to its

origin (via veins)

• Oxygenated blood

• Deoxygenated blood

• Hemostasis

• Vasoconstrict

• Vasodilation

▪ CO2 rich blood

▪ O2 poor blood

- Helps in the coagulation process

• Oxygenated blood

• Deoxygenated blood

• Hemostasis

• Vasoconstrict

• Vasodilation

▪ stoppage of

blood/bleeding

▪ when there’s injury, the

bleeding will stop

because of clotting, then

the clotting will dissolve

through fibrinolysis –

hemostasis is maintained

- Regulates the body temperature

• Oxygenated blood

• Deoxygenated blood

• Hemostasis

• Vasoconstrict

• Vasodilation

▪ The lumen of the blood

vessel constricts, and

because of the pressure,

rate of blood flow

increases → the body

temperature also

increases

• Oxygenated blood

• Deoxygenated blood

• Hemostasis

• Vasoconstrict

• Vasodilation

▪ The lumen dilates/widens

which decreases the rate

of blood flow → body

temperature decreases

• Oxygenated blood

• Deoxygenated blood

• Hemostasis

• Vasoconstrict

• Vasodilation

- Hollow muscular organ

- Four chambers (left atrium, right atrium,

left ventricles, and right ventricles)

- Surrounded by pericardium (thin, fluid-

filled sac)

- About the same size as of a man's

clenched fist

- Less than 1 lb. (250 to 350 grams)

- Fluid inside pericardium

- Not collected by medtechs, doctors

collect them, but medtechs test them

- thin, watery membrane in the outer layer

of the heart.

- Function: covers the heart and attached

to the pericardium.

• Epicardium

• Myocardium

• Endocardium

- thick layer of cardiac muscles in the

middle layer of the heart.

- Function: pumps blood to the arteries by

contracting.

• Epicardium

• Myocardium

• Endocardium

- thin layer of epithelial cells in the inner

layer of the heart.

- Function: lines the valves and interior

chambers.

• Epicardium

• Myocardium

• Endocardium