Warum soll ich Deutsch lernen? Why should I learn German language?
Damit man seine Freunde durch Wörter wie "Unabhaengigkeitserklaerungen", "Siebentausendzweihundertvierundfünfzig" beeindrucken kann. So that one can impress their friends by knowing words such as "independencedeclarations" and 7,254 (number) :)
What is nervous system? What is it made up of and what are it's functions?
Nervous system is one of the major components of human body. Its functional unit called neuron, transmits the information via electrical signals to various parts of the body. Nervous system is divided into two main parts - central nervous system (CNS) and peripheral nervous system (PNS). While CNS consists of brain and spinal cord, PNS includes spinal, cranial and autonomic nerves. These two systems work together to help us to perceive and interact with the world around us. PNS can further be divided into sensory (afferent division) and motor (efferent division). Sensory organs include the main organs by which we perceive our surrounding, such as eye, ear, nose, taste buds, skins. Thus afferent neurons receive the signals via sensory inputs and transmit them to CNS. For every input, there is an output, thus after high cognitive processing, the efferent neurons take the information and transmit it to the periphery. This motor division takes response to glands, smooth muscle, skeletal muscle. Peripheral Nervous System -> Central Nervous System -> Peripheral Nervous System INPUT OUTPUT Afferent Neuron Efferent Neuron (sensory) (motor) receives the electrical signals delivers the electrical signals Output via efferent neuron can be further classified as either somatic(voluntary) or autonomic (involuntary). To understand this concept better, it is easier to use every day examples. We can voluntarily control our body movements, such as move our legs, fingers in any direction when desired. Thus skeletal system can be classified as the part of somatic nervous system. But can we control our heart rate? Normal resting heart beats 60-100 beats per minute. This process is involuntary, thus it can be classified as a part of autonomic nervous system. As we can see, nervous system is quite complex and via communication among its parts, it is able to take control over our body and helps us to interpret all daily events that happen in our lives.
Cardiovascular Question: What are the differences between right atrium and left atrium?
There are couple of differences between right and left atrium. They both are heart chambers, which are separated by a muscular wall, referred as median septum. However, the wall of right atrium is thinner, while wall of left atrium is thicker (this is due to high pressure generated in left atrium). The right atrium has tricuspid valve, which opens to right ventricle, while left atrium has bicuspid valve, which opens to left ventricle. Also one major difference is that right atrium receives DEoxygenated blood, while left atrium receives oxygenated blood.