Welcome to the Quiz!
This quiz contains 10 questions from a mix of 1 subtopics.
What does the term 'myogenic' mean in relation to cardiac muscle?
the muscle contracts due to an electrical signal from the brain
the contraction of the muscle initiates within the heart itself
the muscle contracts in response to physical exercise
the muscle requires external stimulation to contract
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Describe the pathway of the wave of electrical excitation through the heart.
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Which system allows the heart rate to adapt swiftly to the body's changing needs?
endocrine system
digestive system
respiratory system
autonomic nervous system
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Which part of the brain acts as the main control centre for regulating heart rate?
medulla oblongata
cerebellum
hypothalamus
pons
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Where are the baroreceptors located that detect blood pressure and communicate this to the medulla oblongata?
vena cava
pulmonary arteries
carotid arteries and aorta
renal arteries
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What type of receptor detects changes in chemical composition of the blood?
chemoreceptors
thermoreceptors
baroreceptors
photoreceptors
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Which receptors detect changes in blood pressure?
chemoreceptors
nociceptors
thermoreceptors
baroreceptors
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What is the effect on the sinoatrial node when blood pressure is high?
no change in electrical activity
complete cessation of electrical activity
decreased electrical activity
increased electrical activity
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How does low oxygen, high carbon dioxide, or low pH levels affect heart rate?
stops the heart completely
causes the heart rate to speed up
causes the heart rate to slow down
causes no change in heart rate
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High oxygen, low carbon dioxide, or high pH levels cause which autonomic pathway to be activated?
somatic
parasympathetic
sympathetic
enteric
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