Lab 11 The Circulatory System BIO202L
Student Name: Click here to enter text.
Access Code (located on the lid of your lab kit): Click here to enter text.
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 closed circulatory system facilitates the transportation of blood, commencing at the right
atrium of the heart, where it is supplied with deoxygenated blood from the body. Subsequently,
the blood proceeds to the right ventricle, where it is propelled into the pulmonary artery for the
purpose of reaching the lungs and undergoing oxygenation. Following this, the blood is returned
to the heart through the pulmonary veins, entering the left atrium and subsequently the left
ventricle. It is then pumped into the aorta, facilitating its circulation throughout the body and
enabling the delivery of oxygen and nutrients to various tissues.
2. What are the main resistance vessels of the circulatory system?
Arterioles and Endothelium.
3. How are they (the resistance vessels you noted in Question 2) controlled?
Arterioles have a crucial role in regulating and modulating blood flow to capillaries, making them
a significant factor in determining systemic blood pressure. Vasoconstriction primarily occurs as
a result of neural stimuli or the presence of circulating hormones. Vasoconstriction is
significantly influenced by variables generated from the endothelium.
, 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.
2.5 billion times.
2. Give an estimate of how many liters of blood circulate in the human body every minute.
4-6 liters of blood per 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.
Approximatly 35 trillion cells
Student Name: Click here to enter text.
Access Code (located on the lid of your lab kit): Click here to enter text.
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 closed circulatory system facilitates the transportation of blood, commencing at the right
atrium of the heart, where it is supplied with deoxygenated blood from the body. Subsequently,
the blood proceeds to the right ventricle, where it is propelled into the pulmonary artery for the
purpose of reaching the lungs and undergoing oxygenation. Following this, the blood is returned
to the heart through the pulmonary veins, entering the left atrium and subsequently the left
ventricle. It is then pumped into the aorta, facilitating its circulation throughout the body and
enabling the delivery of oxygen and nutrients to various tissues.
2. What are the main resistance vessels of the circulatory system?
Arterioles and Endothelium.
3. How are they (the resistance vessels you noted in Question 2) controlled?
Arterioles have a crucial role in regulating and modulating blood flow to capillaries, making them
a significant factor in determining systemic blood pressure. Vasoconstriction primarily occurs as
a result of neural stimuli or the presence of circulating hormones. Vasoconstriction is
significantly influenced by variables generated from the endothelium.
, 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.
2.5 billion times.
2. Give an estimate of how many liters of blood circulate in the human body every minute.
4-6 liters of blood per 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.
Approximatly 35 trillion cells
