The Cardiovascular System Flashcards
Name the three different components of the blood plasma.
Erythrocytes, eukocytes and platelets.
Which artery doesn’t carry oxygenated blood?
The pulmonary artery.
The cells making up the cardiac muscle are called __________.
Myocytes
How is an action potential transmitted through the septum in the heart?
It is transmitted by the bundle of His.
Noradrenaline is released from which nerve in positive chronotropy?
The cardiac nerve.
What is negative chronotropy?
Parasympathetic stimulation results in ACh being released from Vegas nerve and a decrease in heart rate.
What causes in the partial repolarisation stage of a cardiac action potential?
Voltage-operated potassium ion channels open and there is a slow efflux of potassium ions.
What does intrinsic rhythm mean?
Electrical activity is initiated at regular intervals without any simulation from the nervous system.
Describe the function of renin in the renin angiotensin aldosterone system.
It catalyses the breakdown of angiotensinogen into angiotensin I.
What are the three main effects of an eye angiotensin II?
It is a powerful vasoconstrictor, promotes noradrenaline release from sympathetic nerve terminals and releases aldosterone and vasopressin.
What is responsible for reducing water excretion in the kidney?
Vasopressin
