Chapter 5. The Cardiovascular System Flashcards
Why do veins have thinner walls than arteries?
They carry blood at lower pressure than arteries.
Collateral circulation is
More than one artery supplying an area
What function do the valves serve in blood vessels
Valves keep the blood flow in one direction
Valves are formed from which type of tisssue
Connective
Increasing the diameter of a blood vessel
Vasodilation
The term for the force that pulls fluid into the capillary tissues
Osmotic Pressure
The tissue lining blood vessels
Endothelial
Structures in veins ensuring one-way flow
Valves
Veins can be referred to as these, because they can hold a large quantity of blood
Capacitance Vessels
The mechanism by which gases move across capillary walls
Diffusion
The term given to exchange of gases across capillary walls in the tissue
Internal Respiration
The middle layer of blood vessel walls
Tunica Media
The term for the pressure of blood against the wall of the blood vessel
Hydrostatic pressure
The type of vessel that drains excess tissue fluid away from the tissues
Lymphatic Capillary
Decreasing the diameter of a blood vessel
Vasoconstriction
The layer of the blood vessel wall that secretes nitric oxide
Tunica Intima
The layers of blood vessel from inside to out
- The lumen
- Tunica Intima
- Tunica Media
- Tunica adventitia
The layer of the blood vessel wall composed mainly of fibrous tissue
Tunica adventitia
The middle layer of the blood vessel wall
Tunica Media
The layer of the blood vessel wall is only one cell thick
Tunica intima
The opening down the middle of a blood vessel
Lumen
The wall of large arteries, such as aorta, is rich in this is
Elastic tissue
The term of a blood vessel with a significant capacity for dilation and constriction, in order to control blood flow
Resistance vessel
The term for a blood vessel that expands readily to accommodate large quantities of blood at relatively low pressure
Capacitance vessel
The type of tissue that lines a blood vessel
Endothelium
A small artery
Arteriole
An artery that links two other arteries
Anastomosis
An artery with no other openings except into the capillary bed
End artery
The term for a blockage of a blood vessel
Occlusion
Represents ventricular repolarisation
T wave
Represents atrial depolarisation
P wave
Represents ventricular depolarisation
QRS complex
The term for the normal heart rhythm
Sinus rhythm
An unusually slow heart rate
Bradycardia
An unusually high heart rate
Tachycardia
An abnormal heart rhythm
Arrhythmia
The machine used to record the electrical activity of the heart
Electrocardiograph
A recording of the electrical activity of the heart
Electrocardiogram
Cardiac contraction
Systole
Cardiac Relaxation
Diastole
Electrical activation of a myocardial cell
Depolarisation
Restoration of the myocardial cell membrane potential to its resting state
Repolarisation
The normal pattern of impulse conduction through the heart is
SA node, AV node, Bundle of his, Purkinje fibres