EXS 240 CH 4 Exam 2 (Cardiorespiratory Endurance and Fitness)

Cardiorespiratory Endurance DEF

Ability of the heart and lungs to deliver oxygen to the body

Functions of the Cardiorespiratory system

-Picks up and transfers Oxygen (Oxygen rich or poor blood)

-Distributes nutrients to cells

-Removes metabolic waste

-Maintains fluid balance to prevent dehydration

-Maintains body temp by absorbing and redistributing heat

Role of the Heart

To circulate blood throughout the body

The right side of the Heart does what?

Pumps deoxygenated blood through the lungs (pulmonary circulation)

The left side of the heart does what?

Collects blood from the lungs and pumps oxygenated blood throughout the body (Systemic Circulation)

Blood Pressure def

The force exerted by blood against the artery walls

Blood pressure (make up)

Controlled by nerve impulses

Systole (Contraction) inc during exercise

Diastole (Relaxation) dec during exercise

Heart Rate

number of beats per minute (60 - 80bpm)

Stroke Volume

Amount of blood pumped out per heart beat (70mL per beat)

Cardiac Output

Amount of blood the heart pumps per minute (HRxSV) Rest 2.5L and Max EXS - 12.5L

The heart has its own network of veins,

arteries and capillaries

The coronary arteries supply the heart with oxygen

Veins

Carry deoxygenated blood back to the heart to be deoxygenated. (very skinny and not elastic)

Arteries

Carries blood away from the heart

Capillaries

Delivers oxygen rich blood to the tissues

Cardiorespiratory system is made up of what?

Lungs, Diaphragm, Air passages, Breathing muscles.

Function of the CR system

Supplies oxygen to the body and carries off the waste. Diaphragm contracts to breathe in. (Air passes in and out of the lungs)

The rate and depth of breathing controls the whole system (systemic circulation)

Metabolism

The sum of all chemical processes to maintain the functions of the body

Metabolic Rate

Rate at which your body uses your metabolism (depends on metabolism)

Immediate energy system pathway

Lasts 10-15 seconds up to 20 (peaks at 5s)

Very high intensity

Fuel - cellular stores of ATP and creatine phosphate

ex 40yd dash

Non - Oxidative Energy system pathway

Lasts from 15s to 2 mins

Peaks at 15s but slowly declines

Does not utilize oxygen (high intensity)

Fuel- Breakdown of glucose and glycogen

When glucose and glycogen are depleted lactic acid is produced

ATP produced 2-6 ATP generated

ex 400m

Oxidative Energy system

Used during activities that last longer than 3 mins (about 55 seconds it starts to dominate)

Oxygen must be present ( 70 -85% of MPHR)

Fuel - Carbs(high int) and Fats(low int)

ATP production

ex skiing