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Creado por sferrier96
hace más de 9 años
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Pregunta | Respuesta |
cardiac output= | heart rate x stroke volume |
what is the autonomic nervous system? | the part of the nervous system that controls involuntary activities such as breathing, digestion and heart rate. |
what two nervous systems make up the autonomic nervous system? | sympathetic and parasympathetic. |
Where are chemoreceptors found? | In the carotid arteries and the aorta |
what are chemoreceptors? | receptors that are sensitive to changes in pH. |
where in the brain do the parasympathetic and sympathetic nerves originate? | Medulla oblongata *parasympathetic = cardio-inhibitory centre *sympathetic=cardio-acceleratory centre |
how is heart rate decreased in people with high blood pressure? | *pressure receptors in the walls of the carotid arteries and the aorta detect an increase in blood pressure. *frequency of impulses from these receptors to the cardio-inhibitory centre in the medulla oblongata increase. *frequency of impulses via the parasympathetic nervous system to the SAN increase and heart rate is decreased. |
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