Applied Anatomy and Physiology Flashcards
Myogenic
Originating in muscle tissue.
Sinoatrial Node (SAN)
A small mass of cardiac muscle found in the wall of the right atrium that generates the heartbeat. It is more commonly known as the pacemaker.
Atrioventricular Node (AVN)
Relays the impulse between the upper and lower sections of the heart.
Medulla Oblongata
The most important part of the brain as it regulates processes that keep us alive.
Ejection Fraction
Percentage of blood pumped out by the left ventricle per beat.
Venous Return
The return of blood to the right side of the heart via the vena cava.
Cardiac Hypertrophy
When the heart becomes bigger and stronger due to a thickening of the muscular wall.
Bradycardia
When there is a decreases in resting heart rate to below 60 beats per minute.
Atherosclerosis
When arteries harden and narrow and become clogged up by fatty deposits.
Systolic
When the ventricles are contracting.
Diastolic
When the ventricles are relaxing.
Myoglobin
An iron-containing muscle pigment in slow twitch muscle fibres which has a higher affinity for oxygen than haemoglobin. It stores the oxygen in the muscle fibres which can be used quickly when exercise begins.
Mitochondria
Site at which respiration and energy production occur.
Bohr Shift
When an increase in blood carbon dioxide and a decrease in blood pH results in a reduction of the affinity of haemoglobin for oxygen.
Vascular Shunt Mechanism
The redistribution of cardiac output.
Vasodilation
The widening of the blood vessels to increase blood flow into the cappilaries.
Vasoconstriction
The narrowing of the blood vessels to reduce blood flow into the capillaries.
Arterio-Venous Difference (A-VO2 Diff)
The difference between the oxygen content of the arterial blood arriving at the muscles and the venous blood leaving the muscles.
Tidal Volume
The volume of air inspired or expired per breath.
Minute Ventilation
The volume of air inspired or expired per minute.
Inspiratory Reserve Volume (IRV)
The volume of air that can be forcibly inspired after a normal breath.
Expiratory Reserve Volume (ERV)
The volume of air that can be forcibly expired after a normal breath.
Residual Volume
The amount of air that remains in the lungs after maximal expiration.
Gaseous Exchange
The movement of oxygen from the air into the blood, and carbon dioxide from the blood into the air.
Partial Pressure
The pressure exerted by an individual gas when it exists within a mixture of gases.
Diffusion
The movement of gas molecules from an area of high concentration or partial pressure to an area of low concentration or partial pressure.