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13.1 The Blood Vessels
A series of vessels delivers blood from the heart to the capillaries, where exchanges of substances takes place, and then another series of vessels delivers blood from the capillaries back to the heart.
1. How are large blood vessels nourished with oxygen and nutrients?

2. What determines whether blood flows into one particular capillary bed or another?
Essential Study Partner
Types of Systems
Structure of Blood Vessels
Arteries & Arterioles
Capillary Exchange
Veins & Venules

Art Quizzes
Mammal and Bird Circulation
Gas Exchange Variations

Study Guide
Human Circulation: Blood and Blood Vessels

General Biology Weblinks
Anatomy & Physiology

Labeling Exercises
Blood Vessels (1) (25.0K)
Blood Vessels (1) (32.0K)
Anatomy of a Capillary Bed (37.0K)
13.2 The Heart
The human heart is a double pump: the right side pumps blood to the lungs, and the left side pumps blood to the rest of the body.
3. Give one example of how the heart can be used to illustrate the relationship between structure and function.

4. Does the heart quit beating if the SA node fails?
Essential Study Partner
Human Heart
Heart Blood Flow
Conduction System
Cardiac Cycle
Heart Sounds
Cardiac Output

Art Quizzes
Heart - Electrical Pathway

Animation Quizzes
Cardiac Cycle Blood Flow Normal Speed
Cardiac Cycle Blood Flow Slow Motion
Cardiac Cycle Electrical
Cardiac Cycle Muscular
Cardiac Cycle Sounds
Cardiac Cycle sounds Detail

Study Guide
Human Circulation: Heart Structure and FunctionExplorations
Evolution of the Heart

Case Study
Heart Transplant

Labeling Exercise
External Heart Anatomy (1) (34.0K)
External Heart Anatomy (2) (32.0K)
External Heart Anatomy (3) (41.0K)
Internal View of the Heart (1) (36.0K)
Internal View of the Heart (2) (35.0K)
Internal View of the Heart (3) (33.0K)
Internal View of the Heart (4) (32.0K)
13.3 The Vascular Pathways
The pulmonary arteries transport O2-poor blood to the lungs, and the pulmonary veins return O2-rich blood to the heart.

The systemic circuit transports blood from the left ventricle of the heart to the body and then returns it to the right atrium of the heart.
5. What is a portal system? Give an example of one in the human body.

6. Is arterial blood pressure constant throughout the body?
Essential Study Partner
Vessels and Pressure
Blood Pressure
Systemic Arteries & Arterioles
Systemic Veins & Venules

Animation Exercise
Portal System

Labeling Exercise
Human Circulatory System (1) (45.0K)
Human Circulatory System (2) (44.0K)
13.4 Blood
Blood is composed of cells and a fluid containing proteins and various other molecules and ions

Blood clotting is a series of reactions that produces a clot - fibrin threads in which red blood cells are trapped.

Exchange of substances between blood and tissue fluid across capillary walls supplies cells with nutrients and removes wastes
7. What is the primary function of red blood cells and white blood cells?

8. What portions of the blood participate in clotting?
Essential Study Partner

Case Studies
Artificial Blood
Blood Doping in Cyclers

Labeling Exercise
Hemoglobin Molecule (47.0K)
13.5 Cardiovascular Disorders
Although the cardiovascular system is very efficient, it is still subject to degenerative disorders.
9. What are the two primary disorders that lead to stroke, heart attack, and aneurysm?

10. What are the recommendations for maintaining a healthy cardiovascular system?
Essential Study Partner
Myocardial Infarction

Animation Quizzes
Valvular Insufficiency
Valvular Stenosis
Myocardial Infarction

Labeling Exercise
Plaque (42.0K)

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