As blood enters the artery, the walls of these vessels expand and contract, which can be felt as the pulse where the arteries run close to the body surface.
It is common to detect the pulse with a few fingers placed on the radial artery on the wrist, or the carotid artery in the neck.
Because the walls of the arteries pulse whenever the left ventricle contracts, the pulse rate generally indicates the cardiac function, which is normally between 50 and 85 in a healthy adult.
Pulse is usually defined as the rhythmic dilation of the arteries due to flow of the blood caused by heart contractions. The measurement of the pulse rate can be used for the diagnosis of serious disease such as cardiac disease.
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In childhood for many organisms, there is a "critical period," which is when important learning of certain skills occurs.
The critical period of language learning is a period in the first few years that is crucial for learning a language (language acquisition). After this period, it becomes harder and harder to learn a new language. This is why some immigrants that immigrate later in their lifetime struggle to completely grasp a new language.
Food Chains: Food chain is a model that shows flow of energy and nutrients from one organism to another organism in an ecosystem. ... A food also shows the relation between organisms as who they are related with each other by the food they eat. Plants and animals requires some type of food for survival.