The heart and blood vessels transport , , , and around the body rapidly
What are the four functions of the CV system? 1. 2. 3. 4.
What is the maximum distance diffusion can occur over? (in micrometers)
What is the rate at which blood is pumped around the body? (in cm per second)
10
5
15
3
8
The heart has two pumps. The right and left
The ventricles are filled from reservoirs, also known as the right and left .
The ❌ pumps ❌ blood through the ❌. ❌ ❌ veins return oxygenated blood from the lungs to the ❌ side of the heart. This is called ❌.
What is roughly the pressure at which blood is pumped from the heart to the lungs? (in mmHg)
20
65
80
25
What is roughly the pressure at which blood is pumped from the heart through the aorta? (in mmHg)
90
70
Blood is pumped to the body to tissues, and partly blood is returned to the heart via two veins. The and vena cava.
When blood returns to the heart via two veins, this is known as circulation.
The right ventricle has a greater muscle mass than the left ventricle because it pumps blood at a higher pressure (to all the body).
The ❌ are composed mainly of cardiac muscle, and fill with blood while the muscle is ❌. Relaxation is known as ❌, and contraction is known as ❌.
If heart rate is between 60-75 bpm, and the stroke volume is 70-80ml... what will be the cardiac output? (in L/min) L/min
❌ = ❌ x ❌
Cardiac output can increase greatly in response to increased peripheral oxygen demand, rising 10 to 12 fold during strenuous human exercise.
Blood pressure definition = The exerted by on the walls of the .
Because blood pressure is different in different areas of the body, what type of blood pressure is stated?
convective
pulmonary vein
pulmonary artery
systemic venule
system arterial
systemic arterial
systemic
The circulation of blood is in a arrangement. This means it is divided into circuits, each supplying a specialised tissue/organ.
The ❌ branch from the heart is called ❌. This means blood is supplied to the heart itself.
The left ventricular output is distributed to the tissues of the body in proportion to their metabolic rate. The muscle takes 20% of O2 consumption at rest and receives 20% of the cardiac output. This is different in the because its function requires a blood flow. This causes other tissues to receive less e.g. . To compensate, it extracts an unusually proportion of the O2 (~%), whereas normal = ~%. It is very at taking from blood.
Venules and small veins are more numerous than arterioles and arteries.
Because of their large number and size, veins and venules contain about a 1/2 of circulating blood.
Veins and venules are known as ______ vessels.
capacitance
large
resistance
returning
deoxygenated
Systemic arteries are known as resistance vessels
Drugs that act on the blood are called drugs
There are three types of antithrombotic drugs. What are the classes called?
antiplatelet
coagulants
platelet drugs
anticoagulants
thrombolytic
antithrombolytic
A is a blood clot that forms in a vessel and remains there.
An is a clot that travels from the site where is formed to another in the body.
Name three antiplatelet drugs. 1. 2. 3.
Name three anticoagulants. 1. 2. 3.
Name two thrombolytic drugs. 1. 2.
In terms of a cut, homeostasis is the and bleeding. This results in a and the bleeding .
Blood clot formation. Step 1 = - this is triggered by cells Step 2 = - Platelets together and temporarily stop the blood flow. This is the stage where antiplatelets act on. Step 3 = - Conversion of to ). The insoluble forms a around the platelet plug (causing platelets to to each other).
Antiplatelet drugs act on the venous system
Anticoagulant drugs act on the arteriole system
Anticoagulant drugs act on the venous system
Antiplatelet drugs can be used for what conditions?
Acute myocardial infarction
Unstable coronary syndromes
Transient ischaemic attacks
Atrial fibrillation
Secondary prevention of CV events
Angina
Blood clot
Primary prevention of CV events
Hypertension
Platelet formation
and are which bind to collagen and (vWF), causing platelets to adhere to the of a damaged blood vessel.
PAR1 and are receptors that respond to (IIa)
and are receptors for ADP. When stimulated by , they activate GPIIa/IIIa and (COX-1) to promote platelet .
is a major product of COX-1 involved in . It is involved in the feedback process. It signals to join and become .
is synthesised by cells. It inhibits platelet activation. It is found naturally in the body, and is part of a feedback process of platelet aggregation - it slows the process down.
What three drugs are used to inhibit GPIIb/IIIa receptor?
Aspirin
Clopidogrel
Tirofiban
Eptifibadite
Warfarin
Cangelor
Abciximab
What four drugs are used to inhibit the GPIa/IIa receptor?
Ticlopidine
Prasugrel
Aspirin is a inhibitor of receptors.
Warfarin is a vitamin K antagonist
Warfarin works by the regeneration of the form of vitamin
Vitamin is philic, and is required for the of certain blood . Vitamin K is essential for the synthesis of factors , , , and X.
Warfarin the conversion of oxidised vitamin K into its form, Vitamin K .
Heparin are a family of glycans.
Heparin activates , and inactivates coagulant factors and .
Heparin is given orally.
What are the two types of heparin?
LMWH
Fractionated heparin
Dalteparin
Unfractionated heparin
LWMH
Thrombin Inhibitors
Give four examples of LMWH (Low Molecular Weight Heparin)
Bemiparin
Semiparin
Coxiparin
Foxiparin
Enoxaparin
Tinzaparin
LMWH are than unfractionated heparin because they have a effect on platelet activation and a reported incidence of heparin induced - this is there is a deficiency of platelet in the blood which causes bleeding in the tissues and slow blood clotting.
Name three thrombin inhibitors. 1. 2. 3. Dabigatran
Anticoagulants are used for the prevention of:
DVT
Extension of established DVT
Transient ischaemic attack
Clotting during dialysis
Myocardial infarction (in unstable angina)
Myocardial infarction (in stable angina)
Pulmonary embolus
INR = () to the power of
is the breakdown of fibrin once it has already formed. is the factor that breaks down fibrin. Endothelial cells secrete tissue activator (t-PA) at sites of injury. t-PA binds to and converts to , which digests fibrin. activator inhibitors- and - (PAI-, PAI-) inactivate t-PA; α2-antiplasmin (α2-AP) inactivates plasmin.
Streptokinase is a protein derived from streptococci which inactivates plasminogen
What are the uses of fibrinolytics?
Acute myocardial infarction (within 12 hours of onset)
Chronic myocardial infarction
Acute myocardial infarction (within 24 hours)
Acute thrombotic stroke
Acute arterial thromboembolism
Pulmonary embolism