NASM: Chapter 6 - The Cardiorespiratory, Endocrine, and Digestive Systems

A system of the body composed of two closely related systems that work together to provide the body with adequate oxygen and nutrients and to remove waste products such as CO2 from cells in the body.

Specifically:
-The cardiovascular system consisting of the heart, blood vessels, and blood
and
-The respiratory system consisting of trachea, bronchi, alveoli, and the lungs

A system of the body composed of the heart, blood, and blood vessels that transport the blood from the heart to the tissues of the body.

A hollow muscular organ that pumps a circulation of blood through the body by means of rhythmic contraction.

• Dark bands between cardiac muscle cells

• Help hold muscle cells together during contraction and create an electrical connection between the cells that allows the heart to contract as one functional unit.

The space in the chest between the lungs that contains all the internal organ of the chest except the lungs.

A specialized area of cardiac tissue, located in the right atrium of the heart, which initiates the electrical impulses that determine the heart rate; often termed the pacemaker for the heart.

A small mass of specialized cardiac muscle fibers, located in the wall of the right atrium of the heart, that receives heartbeat impulses from the sinoatrial node and directs them to the walls of the ventricles.

• Smaller chambers, located in the superior (on top) chamber on either side of the heart that acts like a reservoir by receiving blood from the veins and forcing it into the ventricles.

• Right atrium: gathers deoxygenated blood returning to the heart from the entire body

• Left atrium: gathers oxygenated blood coming to the heart from the lungs.

Larger chambers located inferiorly (on bottom) on either side of the heart that receives blood from its corresponding atrium and, in turn, forces blood into the arteries.

• Right ventricle: has thin walls and pumps under low pressure b/c it only has to pump a short distance (to the lungs). Receives deoxygenated blood from the right atrium, then pumps it to the lungs to be saturated with incoming oxygen.

• Left ventricle: has thicker walls and pumps under high pressure b/c it pumps blood out to the rest of the body. Receives oxygenated blood from the left atrium and proceeds to pump it to the entire body.

1. Interatrial septum (separates the atria)

2. Interventricular septum (separates the ventricles)

• The right side.

• It receives blood from the body that is low in O2, and high in CO2 (deoxygenated) and pumps it to the lungs and then back to the left atria.

• The left side.

- It pumps blood high in O2 and low in CO2 (oxygenated) to the rest of the body.

1. Atrioventricular valves (tricuspid and mitral valves)

2. Semilunar valves (pulmonary and aortic valves)

The amount of blood pumped out of the heart with each contraction.

The filled volume of the ventricle before contraction.

Contains approximately 120mL of blood.

The residual volume of blood remaining in the ventricle after ejection.
Contains approximately 50mL of blood.

The difference between EDV and ESV. 
Example:
EDV = 120mL, ESV = 50mL
120-50=70
SV = 70mL

The rate at which the heart pumps.

-The overall performance of the heart. The volume of blood pumped by the heart per minute (mL blood/min).
Formula: heart rate (HR) x stroke volume (SV)
Example: 70bmp (HR) x 70mL/beat (stroke volume) = 4,900mL/min (4.9L/min)

The fluid the circulates in the heart, arteries, capillaries, and veins, which carries nutrients and oxygen to all parts of the body, regulates body temperature, fights infections, and removes waste products.

1. Red blood cells: carry O2 from the lungs throughout the body

2. White blood cells: help fight infection

3. Platelets: help with clotting

Network of hollow tubes that circulates blood throughout the body.

Aqueous, liquid-like component of blood.

Makes up around 55% of blood by volume.

1. Arteries

2. Capillaries

3. Veins

Vessels that transport blood away from the heart.

• The Largest artery in body is the aorta (carries blood away from the heart)

• Branches (medium-sized): carotid artery, subclavian artery, mesenteric arteries, renal artery, and the iliac artery.

• The smallest blood vessels

• The site of exchange of chemicals (O2, Nutrients, Hormones, and waste products) and water between the blood and the tissues.

• Connects venules with arterioles.

Vessels that transport blood from the capillaries toward the heart.

Small terminal branches of an artery, which end in capillaries.

• Vessels (or very small veins) that collect blood from the capillaries and connect capillaries to larger veins.

• Progressively merge with other venules to form veins.

A system of organs (the lungs and respiratory passageways) that collects oxygen from the external environment and transports it to the bloodstream.

Is composed of skeletal structures (bones) and soft tissues (muscles) that work together to allow proper respiratory mechanics to occur and help pump blood back to the heart during inspiration.

1. Inspiration (or inhalation)

| 2. Expiration (or exhalation)

The process of actively contracting the inspiratory muscles to move air into the body (inhalation).

The process of actively or passively relaxing the inspiratory muscles to move air out of the body (exhalation).

• Normal resting state breathing: quiet, uses primary respiratory muscles (diaphragm, external intercostals)

• Heavy deep forced breathing: requires additional use of the secondary respiratory muscles (scalenes, pectoralis minor)

• Consist of all structures that air travels through before entering the respiratory airways. Allows incoming air to be purified, humidified (or moisture added) and warmed or cooled to match body temperature.

• Nasal cavity, oral cavity, pharynx, larynx, trachea, right and left pulmonary bronchi, bronchioles

• Collects the channeled air coming from the conducting airway

• Consists of: alveoli, alveolar sacs (located at the end of bronchioles)

The process of getting oxygen from the environment to the tissues in the body. "Gases such as oxygen or carbon dioxide are transported in and out of the bloodstream through a process known as diffusion."

VO2 = (Q) x (a-VO2)

VO2: oxygen consumption
Q: Cardiac Output (HR x SV)
a-VO2: Arterial-Venous Difference (difference in O2 content between the blood in the arteries and the blood in the veins)

• The highest rate of oxygen transport and utilization achieved at maximal physical exertion.

• The only way to determine VO2 max is to directly measure ventilation, oxygen consumption, and carbon dioxide production during the maximal exercise test.

• V02max values can range anywhere from 40 to 80mL kg-1 min-1, or approximately 11 to 23 METs.

Both contain myofibrils and sarcomeres aligned side by side (gives a striated appearance).

• Cardiac muscle: Involuntary, muscle fibers are shorter than skeletal muscles, has irregularly spaced dark bands between cardiac cells called intercalated discs, built-in conduction system that sends electrical signal rapidly throughout all cardiac cells.

• Skeletal muscle: voluntary, muscle fibers that are longer than cardiac muscle fibers.