NASM 6th Edition chapter 3: The cardiorespiratory system
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NASM study guide chapter 3

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    Chapter 3 NASM Study Guide

    Important definitions

    The cardiorespiratory system: Composed of the respiratory and cardiovascular system

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    The cardiovascular system: Blood vessels, blood, and the heart

    Arteries: Carry blood away from the heart to the rest of the body

    Veins: Return blood to the heart from the rest of the body

    Stroke volume: The amount of blood pumped out the heart with each contraction

    Cardiac output: Heart rate × stroke volume

    Sinoatrial (SA) node: The “pacemaker” of the heart because it initiates the heartbeat

    Typical heart rate for an adult: 70-80 BPM

    The atria and ventricles:

    The heart has two pairs of different chambers. These chambers are called the atriums and ventricles. Here are the functions of the chambers.

    The right atrium receives blood coming from the body while the left atrium receives the blood (oxygen-rich) that comes from the lungs and the heart.

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    The right ventricle has thinner walls because it only needs to pump blood a short distance back to the heart and the lungs. The left ventricle, on the other hand, has much thicker walls and is a much higher pressure pump because it is required to push blood to the rest of the body.

    The functions of blood:

    1. Protection: The white blood cells help to protect your body against diseases and blood clotting helps with fluid loss.
    2. Regulation: Blood helps keep a stable body temperature, electrolyte, and water level as well as pH.
    3. Transportation: The primary function of blood is to transport nutrients and oxygen to the cells of the body. It also takes away CO2 and various wastes from the cells and delivers hormones to specific tissues.

    The respiratory pump:

    These are the thoracic and abdominal structures that help with the contraction and expansion of the lungs.

    The muscles that comprise the respiratory pump are:

    • For inhalation: The Scalene muscles, the pack minor, sternocleidomastoid, and the diaphragm.
    • For exhalation: The internal intercostals and the abdominal muscles

    Here is the cycle of the respiratory pump (venous return):

    Inhalation

    1. The thoracic cavity expands new
    2. The pressure within the pleural cavities drop
    3. This pulls air to the lungs
    4. It also brings blood into the IVC and the right atrium from the smaller veins that exist in the abdominal cavity

    Exhalation

    1. The pressure in the pleural cavities rise
    2. This forces blood into the right atrium
    3. This is important especially for heavy exercises

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    NASM 6th Edition chapter 3: The cardiorespiratory system 1
    NASM 6th Edition chapter 3: The cardiorespiratory system 2
    NASM 6th Edition chapter 3: The cardiorespiratory system 3

    NASM flashcards for chapter 3

    NASM 6th Edition chapter 3: The cardiorespiratory system 3

    About The Author

    6 thoughts on “NASM 6th Edition chapter 3: The cardiorespiratory system”

    1. These study guides do not cover a lot of the information needed to ACE the practice tests. Some terms/definitions are missing.

      1. Hey Josh,
        The study guide does not include every single term or definition from the NASM on exercise textbook. If it did, it would be a lot larger. These are general guidelines and things to focus on but it definitely does not cover everything. If you want a more in-depth Study guide or study system, I suggest checking out Trainer Academy. https://traineracademy.org/nasm/

    2. Hi! I have read and watch tones of videos and info. That tells me not to stress about the chapter 2 and 3. My question is: is this info you have here enough? I want to move on and continue but I don’t want to leave important inf. This chapters have taken way to much time. Thanks

      1. The information I have on my study guide for the National Academy of sports medicine is a good place to start. That being said, is definitely not the one stop shop resource for study materials. There are other much more in-depth study materials if you’re having trouble grasping all of the concepts from NASM.

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