6. Blood unloads O2 and picks up CO2 flowing through one capillary and entering a systemic venule which carry deoxygenated blood away from tissues to merge with larger systemic veins and ultimately back to the right atrium of the heart via the vena cava.
Pulmonary - The right side of the heart is the “Pulmonary Circulation” pump.
1. The right atrium receives “dark red” deoxygenated blood returning from systemic circulation. 2. Blood enters the right ventricle through the Tricuspid Valve 3. Right ventricle ejects blood through the pulmonary valve into the pulmonary trunk which branches into pulmonary arteries and carry deoxygenated blood to the right and left lungs. 4. In pulmonary capillaries blood unloads CO2, which is exhaled and picks up inhaled O2. 5. Oxygenated blood flows into pulmonary veins & returns to the left atrium.
Cardiac Muscle Tissue
Cardiac muscle fibres are shorter in length and less circular in the transverse section than skeletal fibres. Usually one centrally located nucleus but may have two Connect to neighbouring fibres by irregular transverse thickenings of sarcolemma called Intercalated Discs which contain desmosomes holding the fibres together; and gap junctions which allow muscle action potentials to conduct from one muscle fibre to others.
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