Part 2 Of Cardio Heart Lungs Flashcards
Erythrocytes
Contain hemoglobin that binds to oxygen for transport to tissue
Blood
Transports vehicle for nutrient, proteins, hormones, waste products and electrolytes
Leukocytes
Defend the body against disease
Produce antibodies
Destroy bacteria and viruses
Produce marker proteins
Platelets (thrombocytes)
Play a role in the clotting of blood
Plasma
60% total volume of blood. 90% water and 10% solutes
Heart rate
Is regulated by both intrinsic and extrinsic factors
Examples of intrinsic regulation
Sinoatrial node SA
Atrioventricular node AV
Av bundle of his
SA node
A mass of specialized cardiac muscle located on the exterior wall of the right atrium. Initiates the electrical impulse
Av node
Receives from the SA node and delays it about 10 sec for contraction
Av bundle of his
Speeds the impulse over the ventricles to the Purkinje system causing simultaneous contraction of the ventricles
Examples of extrinsic regulation
Sympathetic influence
Parasympathetic influence
Extrinsic regulations
The autonomic nervous system can override the myocardial rhythm
Sympathetic influence
When stimulated , epinephrine ( adrenaline) is causing heart rate to increase
Parasympathetic influence
Release acetylcholine to slow heart rate
Pulmonary circulation
Deoxygenated blood is pumped from the right side of the heart through the pulmonary arteries to the lungs. Oxygenated blood is returned by the pulmonary veins
