Circulatory System Flashcards
The circulation of fluid after it leaves the vascular system and before it re-enters the vascular system
Non-vascular circulation
Secreted by the vascularized choried plexus in the brain into the ventricles of the brain and then passes into the subarachnoid spae
Cerebrospinal fluid
The cerebrospinal fluid then returns from the subarachnoid space to venous channels within the dura mater of the
Head
The circulation of cerebrospinal fluid in the subarachnoid space is an example of
Non-vascular circulation
Fluid in the cardiovascular system passes through a
Closed circuit
The pressure generated by the heart is sufficient to move blood through the
Arteries
Require externally generated pressure (such as pressure from nearby contracting skeletal muscle) and valves to move fluid
Veins
Allow fluid flow in only one direction
Vein valves
In those veins in which blood flow is resisted by high hydrostatic pressure (e.g. the lower limbs) the valves are more likely to become incompetent and result in
Impairment of venous flow and dilation of the veins (varicose veins)
Do all veins have valves?
No
The veins of the portal system and veins communicating between the veins of the face and scalp and the dural venous sinuses within the skull do not have
Veins
In veins without valves, the direction of flow is determined by the
Pressure gradient
A closed circuit
Cardiovascular system
A one-way circulatory system
Lymph vasular system
The lymph from the left side of the head, neck and thorax, the left upper limb, and everything below the diaphragm drains into the
Thoracic duct
The thoracic duct drains into the junction of the
Left subclavian vein and left internal jugular vein
The lymph from the right side of the head, neck and thorax and right upper limb drains into the
Right lymphatic duct
The right lymphatic duct drains into the junction of the
Right subclavin vein and right internal jugular vein
Lymph flows through the lymphatic channels in a direction toward the connection with the
Venous system (i.e. towards the heart)
Extracellular fluid enters lymph capillaries which then drain through
Lymphatic vessels
Contain one-way valves, just like veins
Lymphatic vessels
Interposed along the path of the lymphatic system
-have afferent and efferent vessels
Lymph nodes
Filter the lymph, trapping diseased cells, abnormal
cells, and pathogenic organisms and contain lymphocytes and other cells of the immune system
which attack these trapped cells
Lymph nodes
Transports materials from one part of the body to another
-ex: oxygen from lungs to tissues in the body
Cardiovascular system
