The diagram provides a detailed view of the human respiratory system, focusing on the structures involved in the gas exchange process within the lungs. 1. **Oxygenated Blood to Heart**: This is represented by arrows indicating the direction in which oxygen-rich blood flows back to the heart from the lungs. 2. **Deoxygenated Blood from Heart**: Illustrated with arrows showing how blood without oxygen is transported from the heart to the lungs. 3. **Pulmonary Venule**: Small veins that carry oxygenated blood from the alveoli back to the heart. 4. **Bronchus**: The main passages that direct air into the lungs from the trachea. 5. **Bronchiole**: Smaller branches of the bronchus that end in the alveoli where gas exchange occurs. 6. **Alveoli**: Depicted as clusters of small sacs where the exchange of oxygen and carbon dioxide happens. 7. **Pulmonary Arteriole**: Small arteries that transport deoxygenated blood from the heart to the alveoli. 8. **Smallest Blood Vessels (Capillaries)**: Network of tiny blood vessels surrounding the alveoli, facilitating gas exchange. The blue arrows indicate the movement of deoxygenated blood, while the red arrows show the flow of oxygenated blood, demonstrating the process of oxygen uptake and carbon dioxide release.
Corona Radiata
Corona Radiata is a collection of nerve fibers present in the brain that carries messages between the brain cells of the cerebral cortex and the brain stem. Both brain stem and cerebral cortex play a role in motor function and sensation and it is the corona radiata that links both sensory and motor nerve pathways between these structures.
Neuron Structure
A neuron is defined as the functional unit of the body system called the nervous system. It is significant in transmitting signals that include receiving and sending the signals from a portion of the brain. The neurons are considered specialized cells in terms of their structure.
Afferent Neurons
Neurons are electrically excitable cells in the body specialized for receiving and transmitting information. They are referred to as the structural units of the nervous system. The important parts of a neuron include the cell body, dendrites, and axons.
Motor Homunculus
The term homunculus is Latin and is referred to as ‘little man’. In neuroanatomy, the cortical homunculus is either the motor or sensory distribution along the cerebral cortex of the brain. It was discovered by the great scientist ‘Wilder Penfield and Edwin Boldrey in the year 1937. It is a map that corresponds body part to touch sensitivity. The proportion of the sensory cortex to the size of the body region is irregular. For example, a small area is devoted to sensations that are arising from the trunk, and a large cortical area is devoted to the face and lips.
Nervous System
The nervous system is the portion of an animal's body that controls and transmits signals between various parts of the body. The central nervous system (CNS) and the peripheral nervous system (PNS) are the two primary components of the nervous system in vertebrates. The brain and spinal cord are housed in the CNS. The PNS is made up primarily of nerves, which are long fibers that link the CNS to every other part of the body, but it also includes peripheral ganglia, sympathetic and parasympathetic ganglia, and the enteric nervous system, which is a semi-independent part of the nervous system that regulates the gastrointestinal system.
Can someone explain this diagram? For example, it says here the pulmonary arteriole carries deoxygenated blood to the heart, but I thought arteries carry blood away from the heart?
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