Life Science Lab

Circulatory system

the heart

muscular organ that is controlled by electrical impulses

Chamber of the heart

1- Right atrium: receives deoxygenated blood from the body than

2- the right ventricle: pumps the deoxygenated blood to the lungs

3- left atrium: receives the oxygenated blood from the lungs to the heart

4- left ventricle: pumps oxygenated blood to the body (thicker than right)

Hypertension

too much pressure is being exerted on the blood vessels causing them to weaken

Hypotension

have trouble maintaining enough pressure in the blood vessels to complete the entire circuit of blood flow

thermoregulation

The self-regulated mechanism by which mammals maintain body temperature

What can affect homeostasis

-High blood sugar: impacting insulin levels

-Caffeine: acts as a stimulant (increases heart rate) and a diuretic (increases urine production)

the heart is a _____ ______. which are called___ ______

Double pump // two circulations (pulmonary and systematic)

pulmonary circuit

Heart pumps oxygen-poor blood to lungs. Oxygen is taken up (inhalation). Carbon dioxide released (exhalation). Oxygen-rich blood returns to heart

Systematic Circuit

Heart pumps oxygen-rich blood to all tissues in the body. Carbon Dioxide (waste) is absorbed from the tissue. Oxygen-poor blood returns to heart

Heart attacks

When blood flow is blocked or severely reduced (coronary arteries)

systole

heart contracts to pump blood out of the heart

diastole

the heart relaxes after contraction allowing the chambers to fill with blood

blood pressure (systole and diastole)

high blood pressure occurs when too much pressure is on the blood vessels often caused by narrowing of the blood vessels (due to plaque formation)

healthy blood pressure number

120/80

which tools did we use in class

scalpel and probe

To reduce heat loss (keep heat in) (thermoregulation)

Blood vessels near the skin can constrict to reduce blood flow

To dissipate (get rid of) heat (thermoregulation)

the vessels dilate to increase blood flow in the skin.