The human Body is a very complex organism. It is composed of many different organs systems‚ which are vital for the body to function properly. They work with one another in order to carry out daily life activities and maintain the body’s proper functions. Among these organ systems lies one of the most important‚ the nervous system. The nervous system functions as the control center of the body‚ and it is in charge of the activities of the rest of the organs systems and the body’s components (Marieb
Premium Nervous system Neuron
from the motor cortex of the brain through the spinal cord. The musculocutaneous nerve continues the wave of axon depolarization to individual muscle fibers via motor units. Each motor unit has so many number of motor nerves that extend to individual muscle fibers by way of a neuromuscular junction called the synapse. When the motor nerve is depolarized‚ acetylcholine is released from the axon terminals at the neuromuscular junction. . The acetylcholine binds to the receptor sites on the motor end
Premium Brain Retina Eye
| It produces all the proteins for the dendrites‚ axons‚ and synaptic terminals and contains specialized organelles. | Peripheral nervous system | Consists of the nerves and ganglia outside of the brain and spinal cord. | Dendrites | They are the treelike extensions at the beginning of a neuron. | Somatic nervous system | It is the part of the peripheral nervous system that is responsible for carrying motor and sensory information. | Axon | A long fiber of a nerve cell that acts like a fiber
Premium Brain Central nervous system Nervous system
viewpoint of a photon that enters the eye and passes through the dioptic system to enter the vitreous body. From the vitreous body to the retinal pigment epithelium (RPE) light passes through the following layers of the retina: Optic nerve layer - Axons of ganglion cells that will eventually form the optic nerve Ganglion cell layer (GCL) - The cell bodies of ganglion cells Inner plexiform layer - Synaptic layer‚ where ganglion cell dendrites get inputs from bipolar cells. Inner nuclear layer -
Premium Retina Eye
! ! Activity 2.2.1: The Neuron ! Introduction You are waiting to cross the street at a busy intersection. All of a sudden‚ two cars collide right in front of you. Your hands instantaneously fly up to shield your face. You hear the horrible crunch of metal. You smell the burning rubber of tires and you open your eyes to see the skid marks on the road. Reaching for your cell phone‚ you dial 911. Your heart races as you run out in the street to see if you can be of any help. So much is happening at
Premium Nervous system Neuron
system Neurons consists in: Dendrites : neurons bushy branches and it listens Axons: Tube that passes the messages and it speaks – transmit Action potential : is a neural impulse‚ brief electrical charge that travels down an axon. Threshold: is the level of stimulation required to trigger a neural impulse Myelin Sheath covers an axon and some neurons Synapse : is the junction between the axon tip of the sending neuron and the dendrite or cell body of the receiving neuron.
Premium Nervous system Neuron Brain
Nervous system - Wikipedia‚ the free encyclopedia http://en.wikipedia.org/wiki/Nervous_system Nervous system From Wikipedia‚ the free encyclopedia The nervous system is an organ system containing a network of specialized cells called neurons that coordinate the actions of an animal and transmit signals between different parts of its body. In most animals the nervous system consists of two parts‚ central and peripheral. The central nervous system of vertebrates (such as humans) contains
Premium Nervous system Brain Central nervous system
Chapter 2- Darwin was the first to suggest how evolutionoccurs. Humans belong to the primate family known as hominins. Characteristics that evolved to perform one function but were co-opted to perform another function are called exaptations. Each group of three consecutive nucleotide bases along the strand of messenger RNA is called a codon‚ which instructs the ribosome to add amino acids to the protein being constructed. Subsequent to the nature-nuture issue‚ a second line of thought surrounding
Premium Neuron Nervous system Action potential
allowing sodium ions to diffuse into the axon along their electrochemical gradient. Entry of these Na+ ions causes the inside of the axon to be less negative. As threshold is reached‚ there is a greater influx of sodium ions and the potential difference increases to +40mV‚ so the inside is positive‚ and the outside is negative. This is when the sodium channels start to close and the voltage-gated potassium channels begin to open‚ so the K+ ions move out of the axon. Therefore‚ the potential difference
Premium Cellular respiration Citric acid cycle Cell cycle
EXERCISE 3: Neurophysiology of Nerve Impulses ACTIVITY 1: The Resting Membrane Potential Answers 1. The nervous system contains two general types of cells: neuroglia cells and a. nerves. b. cell bodies. c. neurons. d. nephrons. 2. The resting membrane potential of the neuron in this lab under the control conditions was _______ mV. 3. True or False: For most neurons‚ the concentration of Na+ and K+ ions inside and outside the cell are the primary factors that determine the resting membrane
Premium Action potential