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INEFFICIENCY OF OPEN CIRCULATORY SYSTEM
– The low speed of circulation in the insect is due to:-
FUNCTIONS OF THE CIRCULATORY SYSTEM OF INSECTS
ADVANTAGES OF A (DOUBLE) CLOSED CIRCULATORY SYSTEM OVER AN OPEN ONE.
The amount flowing to a certain organ can be regulated by changing diameter of the blood vessels.
Similarities
RELATIONSHIP BETWEEN CAPILLARIES, MELIS ………….AND LYMPHATIC
FORMATION OF TISSUE (INTERCELLULAR) FLIUD.
A high pressure at the arteride end of the capillary bed develops due to;-
From it cells extract useful materials (glucose, amino acids, fatty acids and into it they secrete their CO2 and nitrogenous waste, hence acting as a means by which materials are exchanged between the blood and the body cells.
THE LYMPHATIC SYSTEM
. Hydrostatic pressure
The pressure of the tissue fluid leaving the arteroles helps push lymph along the lymph system.
Skeletal muscle contraction.
Which compresses vessels, exerting pressure on the lymph within them.
The vessels in the lymph (system) vessels ensure that this pressure pushes the lymph in one direction, i.e. towards the heart.
. Inspiratory movements
THE LYMPH NODES AND THEIR FUNCTIONS
The lymph nodes
Along the lymph vessels are a series of lymph glands or nodes. Most lymph nodes are found in the neck, the arm pits, the groin and around the intestines and ‘lungs’.
Functions
During some infections, lymph nodes in the neck or art pits may swell due to accumulation of lymph and cells in them. That is why during physical examination a doctor sometimes presses the lymph nodes in the neck.
NB
Lymph is a milky liquid rich in lymphocytes and fats obtained from lacteals of the ileum.