In other words, neurotransmitters are the messages that nerve cells send out, and they cross the gaps between each of the cells. When released by the sending neuron, neurotransmitters travel across the synapse and neuron. Therefore, they influence whether that neuron will generate a neural impulse or not. B) An agonist mimics neurotransmitters functions by binding to receptor sites and stimulating the sending neuron. C) An antagonist does the opposite of agonist.
D. keratometry. Answer Key: B Question 7 of 20 1.0 Points Which is a structure divides the external ear from the middle ear and can be visualized during otoscopy? A. cochlea B. tympanic membrane C. stapes D. vestibule Answer Key: B Question 8 of 20 1.0 Points The second bone of the middle ear is the: A. incus. B.
The lateral nucleus is concerned with detecting the direction from which the sound is coming, presumably by simply comparing the difference in intensities of the sound reaching the two ears and sending an appropriate signal to the auditory cortex to estimate the direction. The medial superior olivary nucleus, however, has a specific mechanism for detecting the time lag between acoustical signals entering the two ears. This nucleus contains large numbers of neurons that have two major dendrites, one projecting to the right and the other to the left. The acoustical signal from the right ear impinges on the right dendrite, and the signal from the left ear impinges on the left dendrite.The intensity of excitation of each neuron is highly sensitive to a specific time lag between the two acoustical signals from the two ears.The neurons near one border of the nucleus respond maximally to a short time lag, while those near the opposite border respond to a long time lag; those in between respond to intermediate time lags. Thus, a spatial pattern of neuronal stimulation develops in the medial superior olivary nucleus, with sound from directly in front of the head stimulating one set of olivary neurons maximally and sounds from different side angles stimulating other sets of neurons on opposite sides.
The sound wave then enter into the eardrum where vibrations are matched. The eardrum sends the vibration waver to the middle ear whose job is to transfer sound waves to the hammer, the anvil, and the
The Pros and Cons of the Cochlear Implant HS Extension Site To begin to know the advantages and disadvantages of the Cochlear Implant we need to be clear exactly what it is. The Cochlear Implant is an electronic device which is implanted into the human ear, via surgery. Their function is to stimulate the auditory nerve and help people who are severely hearing impaired or are profoundly deaf, improve their hearing ability. The cochlear implant, converts acoustic sounds into electrical pulses. These pulses, in turn, stimulate the auditory nerve directly.
More information about scoring 1. Match the structure with its function. Option Your Answer 1.1 Correct occipital lobe C. vision 1.2 Correct pineal gland B. secretes melatonin; involved in the body clock 1.3 Correct medulla oblongata D. contains vital nuclei for ventilation, blood pressure, and heart activity 1.4 Correct postcentral gyrus F. primary somatic sensory cortex 1.5 Correct parietal lobe E. body sense, perception, and speech 1.6 Correct vagus nerve A. controls organs; main parasympathetic nerve 2. Match the structure with its function. Option Your Answer 2.1 Correct thalamus B. processing information going to cerebrum 2.2 Correct cerebellum D. motor coordination, balance 2.3 Correct corticospinal tract C. carries direct orders from cerebrum to ventral horn motor
Learning Activity Unit 2 Study Guide: Senses and Perception Senses 1. List the five senses and the area of the brain where each is processed. a. Smell- receptor neurons in the frontal lobe b. Taste- brain stem c. Touch- parietal lobe d. Sight- occipital lobe e. Hearing- temporal lobe 2. Explain the purpose of the sensory organs and how they send messages to the brain. • Sensory organs function as receptors and receive the stimuli, then it sends nerve impulses to the related effectors.
The hippocampus on the other side is responsible for the production of corticosteroids (chemicals that produce physiological responses to stimuli). How the mind creates memories is controlled by the hippocampus. So as to work efficiently, the amygdala and the hippocampus rely on each other greatly. The amygdala regulates the responses to stimuli and the hippocampus uses these responses in the formation of both short-term and long-term memories. Damage to the amygdala or hippocampus causes loss of emotions and memory respectively.
Unit 7 Assignment 2: The Effects of Selected Drugs and Diseases on the Central Nervous System 1. The CNS otherwise known as the Central Nervous System is comprised of the brain which is continuous with the spinal cord. Since the CNS is made up of the brain and spinal cord it is protected by the hard bony skull and vertebral column. (Pages 418- 420) 2. The BBB also known as the Blood Brain Barrier which in conjunction with the Cerebrospinal Fluid or CSF is what nourishes and protects the cells of the CNS.
#1 Graded potential starts in the sensory receptors in the skin 2. #5 A synapse in the thalamus creates a graded potential followed by an action potential in the secondary interneuron, Which reaches the cerebral cortex 3. #2 The graded potential triggers an action potential in a sensory neuron 4. #8 the lower motor neuron forms a neuromuscular synapse with the hand muscles, which causes the muscles to contract as he writes the letter 5. #7 In another synapse the neurotransmitter creates a graded potential which triggers an action potential in the lower motor neuron 6.