Sinoatrial node part of the autonomic nervous system adjusts the heart rate and the arteriole diameter to regulate blood pressure through negative feedback
The SA (sinoatrial) node is generates an electrical signal that can causes the upper heart of the chambers (atria) to contract. The signal and then passes through the AV (atrioventricular) node to the lower of the heart chambers (ventricles), causing them to contract, or to pump. The SA node is considered the pacemaker of heart.
The sinus node continuously generates electrical impulses, thereby setting the normal rhythm and also rate in a healthy heart. Hence, the SA node is also referred to as the natural pacemaker of the heart
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Central africa, in the area of the Central African Republic and the Democratic Republic of the Congo, is tropical rainforest. Your answer should be A.
Answer:
It is family
Explanation:
A dynasty is when one family rules a country or region over a long period of time. Generally, the head of the family will be the ruler of the land, like an emperor or king.
Explanation:
where are the answer choices?
This text makes a tour through the most important aspects of residents' attitudes towards the impact of tourism in relation to some of the most studied variables that attempt to explain the behaviour of residents. The heterogeneity of methodologies and different models or theories proposed to the present day, have not produced results with universal validity or efficacy, so these studies could be directed to the analysis of other variables beyond the tourism sector and especially focusing on local studies. Tourist destinations are places conditioned by history, tourist developments, social and cultural aspects which make each tourist area identified by factors that shape the zone. This paper opens a discussion on the limitations of the methods and theories developed for the study of resident attitudes towards tourism. The creation of a new framework of study that overcomes the identified problems is advocated.
