These labs are known for high failure rates. Therefore, if I show an example
using data, a graph, etc… yours may be totally different depending upon mine and
yours success with the lab. So don’t freak if your data is completely different from
mine. And therefore the analysis of results sometimes may need to be answered
differently since you base your analysis off your data and not mine.
DO NOT CHEAT!
The human circulatory system is a collection of structures thorough which
oxygen and nutrient rich blood flows to all tissues of the body for metabolism and
growth, and to remove metabolic wastes. The blood is pumped to these tissues by the
heart through a circuit composed of arteries, arterioles, capillaries, venules, and veins.
Oxygenated blood is pumped to the tissues from the left side of the heart, whereas
deoxygenated blood is pumped to the lungs from the right side of the heart. This circuit
where gas exchange takes place within the alveoli of the lung is very important and is
known as the pulmonary circuit. When the body is exercised changes can take place in
the circulatory system that allow more blood to pass to actively respiring muscle cells and
less to nonmuscular tissue. Increased heart rate, arterial pressure, body temperature, and
breathing rate also occur during exercise.
Arterial blood pressure is directly dependant on the amount of blood pumped by the heart
per minute and the resistance to blood flow through the arterioles. This is an important
measurable aspect of the circulatory system and it is measured using a
sphygmomanometer. This device has an inflatable cuff that connects to a hand pump and
a pressure gauge, graduated in millimeters of mercury, by rubber tubing. The cuff is
wrapped around the upper arm and inflated, the person taking the pressure then listens for
two sounds and observes the gauge to determine what the blood pressure is. The systolic
number is determined by the first noise heard as the cuff is deflated, and the diastolic
number is determined by the last distinct noise heard.
From this experiment it is expected that a subject’s heart rate and blood
pressure will change during rest and exercise based on how physically fit they are. If the
subject is in good shape the heart rate will not increase significantly and the blood
pressure will increase. The opposite is true of someone in poor shape.
The materials used in this experiment include a blood pressure kit, alcohol
swabs, a stopwatch, two depression slides, a cotton ball, four rubber bands, a pipet, a
petri dish, a
culture, a stereomicroscope, and some ice.