Straighterline BIO202L Lab 11 The Circulatory System Completed Worksheet with all lab photos
(Latest Version August 2024)
Lab Report Format Expectations
Utilize college level grammar and professional formatting when completing this worksheet.
Submissions without proper formatting, all required photos or sufficient responses will be rejected. Pre-
lab Questions
1. Describe the pathway of blood traveling through the closed system of the circulatory system
starting with the right atrium.
The right atrium and right ventricle are where blood initially enters the heart. The right ventricle
pumps blood to the lungs, supplying oxygen. Blood that has been oxygenated is returned to the
left atrium via the pulmonary veins and the left ventricle. The left ventricle uses the aorta to
transport blood to the body's organs.
2. What are the main resistance vessels of the circulatory system?
The arterioles and tiny arteries are the main types of resistant vessels in the cardiovascular and
circulatory systems. Because the vessels are elastic, their capacity to expand and compress
alters their resistance.
3. How are they (the resistance vessels you noted in Question 2) controlled?
Arterioles constrict as a result of stimulation of the sympathetic nervous system. Vasopressin,
another name for ADH, is a hormone that regulates arterioles.
, Lab 11 The Circulatory System BIO202L
EXPERIMENT 1: MICROSCOPIC EXAMINATION OF BLOOD VESSELS
Introduction Questions
For the following questions, provide reasonable estimates as stated. These estimates must be realistic
for credit. (Hint: These estimates are provided in the lab materials, so your responses should be close to
those values.)
1. Give an estimate for how many times the heart beats over the course of a lifetime.
The heart beats approximately 2.5 billion times in a person's lifespan.
2. Give an estimate of how many liters of blood circulate in the human body every minute.
5.6 liters every minute.
3. The heart must constantly deliver oxygen via blood cells to the rest of the cells in the human
body. Provide an estimate of how many cells there are in the human body.
In the world, there are roughly 36 trillion men and 28 trillion women.
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