Human Anatomy and Physiology Practice Test 5Pankaj SahaNovember 26, 2022 0% 0 Human Anatomy and Physiology Practice Test 5 This Human Anatomy and Physiology Practice Test Contains 250 Questions but every time you will get 20 different Questions to answer 1 / 20 The metabolic rate is least affected by an increase in the plasma level of TRH None of the above TBG TSH 2 / 20 A young boy was diagnosed with congenital anosmia, a rare disorder in which an individual is born without the ability to smell. Odorant receptors are located on neurons that project directly to the olfactory cortex located in the olfactory bulb located on dendrites of mitral and tufted cells located on neurons in the olfactory epithelium that project to mitral cells and from there directly to the olfactory cortex. 3 / 20 The functions of tropomyosin in skeletal muscle include binding to myosin during contraction generating ATP, which it passes to the contractile mechanism sliding on actin to produce shortening. acting as a "relaxing protein" at rest by covering up the sites where myosin binds to actin. 4 / 20 A 62-year-old white woman experienced a rapid onset of blurry vision along with loss of central vision. A comprehensive eye exam showed that she had wet age-related macular degeneration. The fovea of the eye contains only rods has the lowest light threshold. contains only red and green cones. is the region of highest visual acuity. 5 / 20 Which of the following describes a connection between components of the basal ganglia? The striatum releases acetylcholine to excite the substantia nigra pars reticulata. The substantia nigra pars compacta releases dopamine to excite the globus pallidus, external segment. The substantia nigra pars reticulata releases dopamine to inhibit the striatum The subthalamic nucleus releases glutamate to excite the globus pallidus, internal segment 6 / 20 The growth hormone receptor resembles the IGF-I receptor. must be internalized to exert its effects. resembles the ACTH receptor. requires dimerization to exert its effects. 7 / 20 The action potential of skeletal muscle is longer than the action potential of cardiac muscle. spreads inward to all parts of the muscle via the T tubules. None of the above has a prolonged plateau phase 8 / 20 Gastric pressures seldom rise above the levels that breach the lower esophageal sphincter, even when the stomach is filled with a meal, due to which of the following processes? Gastroileal reflex Receptive relaxation Stimulation of the vomiting center Segmentation 9 / 20 While exercising, a 42-year-old woman developed sudden onset of tingling in her right leg and an inability to control movement in that limb. A neurologic exam showed a hyperactive knee jerk reflex and a positive Babinski sign. Which of the following is not characteristic of a reflex? Reflexes are chronically suppressed after spinal cord transection Reflexes can be modified by impulses from various parts of the CNS Reflexes may involve simultaneous contraction of some muscles and relaxation of others Reflexes involve transmission across at least one synapse 10 / 20 The correct sequence of events involved in phototransduction in rods and cones in response to light is: structural changes in rhodopsin, activation of transducin, decrease in intracellular cGMP, closure of Na+ channels, and decreased release of glutamate decreased release of glutamate, activation of transducin, closure of Na+ channels, decrease in intracellular cGMP, and structural changes in rhodopsin structural changes in rhodopsin, decrease in intracellular cGMP, decreased release of glutamate, closure of Na+ channels, and activation of transducin. activation of transducin, decreased release of glutamate, structural changes in rhodopsin, closure of Na+ channels, and decrease in intracellular cGMP 11 / 20 A 57-year-old man had severe hypertension that was found to result from a tumor compressing on the surface of the medulla.Which one of the following statements about pathways involved in the control of sympathetic nerve activity is correct? Preganglionic sympathetic nerves receive inhibitory input from the rostral ventrolateral medulla. The activity of sympathetic preganglionic neurons can be affected by the activity of neurons in the amygdala. Unlike the activity in ?-motor neurons, sympathetic preganglionic neurons are not under any significant reflex control. The major source of excitatory input to preganglionic sympathetic nerves is the paraventricular nucleus of the hypothalamus. 12 / 20 Thirst is stimulated by decreases in plasma osmolality and volume an increase in plasma osmolality and a decrease in plasma volume increases in plasma osmolality and volume. a decrease in plasma osmolality and an increase in plasma volume 13 / 20 Which of the following physiologic processes is not correctly paired with a structure? Endplate potential : muscarinic cholinergic receptor Synaptic vesicle docking and fusion : presynaptic nerve terminal Electrical transmission : gap junction Negative feedback inhibition : Renshaw cell 14 / 20 A 32-year-old woman experienced the sudden onset of a severe cramping pain in the abdominal region. She also became nauseated. Visceral pain is mediated by B fibers in the dorsal roots of the spinal nerves. shows relatively rapid adaptation causes relaxation of nearby skeletal muscles is poorly localized. 15 / 20 A 50-year-old man comes to see his clinician complaining of severe epigastric pain, frequent heartburn, and unexplained weight loss of 20 pounds over a 6-month period. He claims to have obtained no relief from over-the-counter H2 antihistamine drugs. He is referred to a gastroenterologist, and upper endoscopy reveals erosions and ulcerations in the proximal duodenum and an increased output of gastric acid in the fasting state. The patient is most likely to have a tumor secreting which of the following hormones? Secretin Motilin Gastrin Somatostatin 16 / 20 A 35-year-old woman in whom multiple system atrophy was diagnosed had symptoms indicative of failure of sympathetic nerve activity. Which of the following statements about the sympathetic nervous system is correct? All postganglionic sympathetic nerves release norepinephrine from their terminals Acetylcholine is released from all sympathetic preganglionic nerve terminals Cell bodies of preganglionic sympathetic neurons are located in the intermediolateral column of the thoracic and sacral spinal cord. The sympathetic nervous system is required for survival 17 / 20 In infants, defecation often follows a meal. The cause of colonic contractions in this situation is the enterogastric reflex. increased circulating levels of somatostatin. the gastrocolic reflex the enterogastric reflex. 18 / 20 The Golgi complex is an organelle that participates in the breakdown of proteins and lipids is an organelle that participates in posttranslational processing of proteins is an organelle that participates in energy production. is an organelle that participates in transcription and translation 19 / 20 A 45-year-old woman visited her clinician after experiencing sudden onset of vertigo, tinnitus and hearing loss in her left ear, nausea, and vomiting. This was the second episode in the past few months. She was referred to an otolaryngologist to rule out M?ni?re disease. Which of the following statements correctly describe the functions of the external, middle, or inner ear? Contraction of the tensor tympani and stapedius muscles of the middle ear cause the manubrium of the malleus to be pulled outward and the footplate of the stapes to be pulled inward The cochlea of the inner ear contains receptors for hearing, semicircular canals contain receptors that respond to head tilt, and the otolith organs contain receptors that respond to rotation. Sound waves are funneled through the external ear to the external auditory meatus and then they pass inward to the tympanic membrane The semicircular canals, the utricle, and the saccule of the middle ear are concerned with equilibrium. 20 / 20 Which part of the ECG corresponds to ventricular repolarization? The PR interval The T wave The QRS duration The P wave Your score is The average score is 0% LinkedIn Facebook Twitter VKontakte 0% Restart Quiz Send feedback Pos.NameScoreDurationThere is no data yet
