20 Questions
What type of muscle fibers are present in the myocardium?
Striated muscle with features of smooth muscle
What initiates the action potential within the heart?
Autorhythmic cells
What is the basic rate of action potential generation within the heart?
80-100 bpm
Which phase of the heartbeat involves the relaxation of heart muscles and allows the chambers to fill with blood?
Diastole
Which structure prevents valve cusps from billowing into the atria during contraction?
Papillary muscle
Which component of the cardiovascular system is described as weighing around 300g and beating around 100,000 times a day?
heart
What is the purpose of the pericardium in relation to the heart?
Surrounding and protecting the heart
In groups, one of the tasks is to draw and label the structure of the _____________.
Heart
What is the innermost layer of tissue that lines the chambers of the heart known as?
Endocardium
The successful student should be able to describe the mechanism of ____________ contraction by the end of the lecture and appropriate independent study.
Heart muscle
What is the approximate weight of the heart?
300g
How many times does the heart beat in a lifetime?
3 billion
Which system of the blood vessels is not mentioned in the lecture?
Lymphatic system
What surrounds the heart?
Pericardium filled with fluid
What is the innermost layer of tissue that lines the chambers of the heart called?
Endocardium
What is the role of autorhythmic cells within the heart?
Generate minimal contraction and spontaneously generate action potentials
In the context of heart muscle valves, how many leaflets does the bicuspid valve have?
Two leaflets
During which phase of the heartbeat does the heart muscle contract and pump blood from the chambers into the arteries?
Diastole
What is the function of the chordae tendinae within the heart?
Prevent valve cusps from billowing into the atria during contraction
How do the muscle fibres in the cardiac muscle differ from skeletal muscle fibres?
They have larger mitochondria and are more fatigue-resistant
Test your knowledge on the structure and function of the cardiovascular system, including the heart, blood vessels, and heart muscle contraction. This quiz is based on the lecture 'Structure and function of the Cardiovascular System' from the Foundations for Physiotherapy Practice course.
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