Heart Flashcards
(27 cards)
2 substances transported by blood and place where each substance enters the blood
Hormones-endocrine gland
Antibodies-b lymphocytes
Precise location and role of SV node
Location:right atrium
Role:generates electrical impulses
Precise location and role of AV node
Location:septum between right atrium and right ventricle
Role:causes ventricular contractions
Blood measure
Force of blood against the wall of the artery
Transports blood out of the heart
Coronary vein
Brings blood away from kidneys
Renal vein
Carries very little co2
Pulmonary vein
Brings blood to right atrium
Vena cava
Has capillaries at both end
Hepatic portal vein
How blood is moved through veins
Muscles contract to move the blood
Valves prevent back flow
Pulse
Alternate expansion and contraction of arteries
Why is the wrist suitable for checking pulse
Artery is close to the surface
Why are co2 levels usually higher in venous blood rather than arterial blood
Venous blood has collected co2 from respiration
Why are co2 levels low in pulmonary vein
Blood has been cleared of co2 in the lungs
Role of co2 in human breathing rate
Medulla oblongata registers co2 levels in the blood
More co2=faster breathing
Less co2=slower breathing
One way in which lymph differs from blood
Contains no red blood cells
2 functions of lymphatic system
- fighting infection
2. transport digested lipids around the body
2 ways in which red blood cells differ from white blood cells
- red blood cells do not have a nucleus
2. red blood cells contain hameglobin
Name another group of white blood cells
Monocytes
Role of antibodies
To activate antigens
Types of T cells
Helper T cells-stimulate B cells
Killer T cells-attack infected cells
Memory T cells-remember antigens
Cavity in the body in which the lungs and heart are located
Thoraic
One way in which the heart differs from different muscles
Doesn’t tire
2 circuits in circulatory system
Pulmonary circuit
Systemic circuit
