Class Notes (1,100,000)
US (480,000)
Halawa (10)
Lecture 11

WELL 175 Lecture Notes - Lecture 11: Endothelium, Systolic Geometry, Aorta


Department
WELLNESS & SPORT SCIENCES
Course Code
WELL 175
Professor
Halawa
Lecture
11

This preview shows half of the first page. to view the full 2 pages of the document.
Chapter 3: Cardiorespiratory Endurance
I. Basic Physiology of Cardiorespiratory Endurance Exercise
a. The Cardiorespiratory System
- Cardiorespiratory System: the system that circulates blood through the
body; consists of the heart, blood vessels, and respiratory system (lungs)
- Circulates blood, which transports oxygen, nutrients, and other key
substances to the organs and tissues that need them. It also helps to carry
away waste products
1. The Heart
- The heart is a four-chambered, fist-sized muscle located just beneath the
sternum (breastbone)
- Right Side
1. Pumps oxygen-poor blood to the lungs through pulmonary
circulation: the part of the circulatory system that moves blood
between the heart and the lungs; controlled by the right side of the
heart
- Left Side
1. Pumps oxygen-rich blood to the rest of the body through
systematic circulation: the part of the circulatory system that
moves blood between the heart and the rest of the body; controlled
by the left side of the body
- Steps to the Heart
1. Deoxidized blood travels through the venae cavae (the large veins
through which blood is returned to the right atrium of the heart)
into the atrium (one of the two upper chambers of the heart in
which blood collects before passing to the ventricles)
2. After the right atrium fills, it contracts and pumps blood into the
heart’s right ventricle (one of the two lower chambers of the heart
from which blood flows through arteries to the lungs and other
parts of the body)
3. When the right ventricle is full, it contracts and pumps blood
through the pulmonary artery into the lungs
4. In the lungs, blood picks up oxygen and discards carbon dioxide.
Oxygen moves from the lungs to the blood and carbon dioxide
moves from the blood to the lungs by a process called diffusion
(the process by which oxygen moves from the lungs to the blood
and carbon dioxide moves from the blood to the lungs; faster
breathing concentrates oxygen and decreases carbon dioxide in the
lungs and promotes diffusion)
5. The cleaned, oxygenated blood flows from the lungs through the
pulmonary veins into the heart’s left atrium
6. After the left atrium fills, it contracts and pumps blood into the left
ventricle
7. When the left ventricle is full, it pumps blood through the aorta
(the body’s largest artery; receives blood from the left ventricle
and distributes it to the body) for distribution to the rest of the
body’s blood vessels
find more resources at oneclass.com
find more resources at oneclass.com
You're Reading a Preview

Unlock to view full version