5.5 questions I struggle on Flashcards
what does the vagus nerve do in terms of heart rate
decreases heart rate
what does the accelerans nerve do in terms of heart rate
increase heart rate
where are chemoreceptors found and what do they do
found in the carotid arteries, the aorta and the brain and monitor pH of the blood
what will chemoreceptors send action potentials to
to the cardiovascular center
what do stretch receptors in the carotid sinus monitor
monitor blood pressure
where is the cardiovascular centre located
the medulla oblongata
what three centres does the medulla oblongata contain
-the cardiac centre, which regulates heart rate
-the vasomotor centre which regulates circulation and blood pressure
-the respiratory centre, which controls the depth of breathing.
whats the cellular structure of skeletal muscle
-striated, bands of actin and myosin.
-multinucleate
whats the function of skeletal msucle
-to move bones/ joints/ skeleton
whats the cellular structure of involuntary (smooth muscle)
-non striated
-spindle shaped
function if involuntary (smooth) muscle
-controls the diameter of arteries/ bronchi
-pupil size
whats the cellular structure of cardiac muscle
-striated
-branched cells
-intercalated discs
whats the function of the cardiac muscle
-to pump blood
what part of the brain is involved in clapping hands together
cerebral cortex
describe and explain how the activation of the ‘flight or flight’ response affects voluntary, involuntary and cardiac muscle
-sympathetic motor neurones are stimulated
-noradrenaline neurotransmitter released at neuromuscular junction
-adrenaline secreted from adrenal glands/ medulla
-adrenaline/ noradrenaline binds to receptors
-heart beats faster
-less blood flows to skin
-pupils dilate
-breathing occurs faster
-smooth muscle in gut relaxes, less digestive activity
-smooth muscle in airway relaxes/ gets wider so more O2 in
