Zoology Test - 28 April Youtube LiveContact Number: 8527521718Zoology Test - 28 April Youtube LiveContact Number: 8527521718A "resting" motor neuron is expected to
1. releases lots of acetylcholine.
2. to have high permeability to sodium ions.
3. to be equally permeable to sodium and potassium ions.
4. exhibit a resting potential that is more negative than the "threshold" potential.
Neurotransmitters categorized as inhibitory would are expected to
1. act independently of their receptor proteins.
2. close potassium channels.
3. open sodium channels.
4. hyperpolarize the membrane.
Integration of simple responses to certain stimuli, such as the patellar reflex, is accomplished by which of the following?
1. spinal cord
2. hypothalamus
3. corpus callosum
4. cerebellum
Which of the following activities would be associated with the parasympathetic division of the nervous system?
1. rest and digestion
2. release of both acetylcholine and epinephrine
3. increased metabolic rate
4. fight-or-flight response
What controls the heart rate?
1. neocortex
2. medulla
3. thalamus
4. pituitary
Which of the following regulates body temperature?
1. cerebrum
2. cerebellum
3. thalamus
4. hypothalamus
What do Wernicke's and Broca's regions of the brain affect?
1. olfaction
2. vision
3. speech
4. memory
The pathway leading to the perception of sound by mammals begins with the
1. hair cells of the organ of Corti, which rests on the basilar membrane, coming in contact with the tectorial membrane.
2. hair cells of the organ of Corti, which rests on the tympanic membrane, coming in contact with the tectorial membrane.
3. hair cells of the organ of Corti, which rests on the tectorial membrane, coming in contact with the basilar membrane.
4. hair cells of the organ of Corti coming in contact with the tectorial membrane as a result of fluid waves in the cochlea causing vibrations in the round window.
Which of the following is an incorrect statement about the vertebrate eye?
1. The vitreous humor regulates the amount of light entering the pupil.
2. The transparent cornea is an extension of the sclera.
3. The fovea is the center of the visual field and contains only cones.
4. The ciliary muscle functions in accommodation.
Which of the following is (are) true?
1. Hormones regulate cellular functions, and generally, negative feedback regulates hormone levels.
2. The circulating level of a hormone is held constant through a series of positive feedback loops.
3. Both lipid-soluble hormones and water-soluble hormones bind to intracellular protein receptors.
4. The ducts of endocrine organs release their contents into the bloodstream.
Do short blood vessels connect two capillary beds lying in which of the following?
1. hypothalamus and thalamus
2. anterior pituitary and posterior pituitary
3. hypothalamus and anterior pituitary
4. posterior pituitary and thyroid gland
Which hormone exerts antagonistic action to PTH (parathyroid hormone)?
1. thyroxine
2. epinephrine
3. growth hormone
4. calcitonin
Which of the following are synthesized from the amino acid tyrosine?
1. epinephrine
2. catecholamines
3. thyroxin
4. All of the following
Which of the following statements about the adrenal gland is correct?
1. During stress, TSH stimulates the adrenal cortex and medulla to secrete acetylcholine.
2. During stress, the alpha cells of islets secrete insulin and simultaneously the beta cells of the islets secrete glucagon.
3. During stress, ACTH stimulates the adrenal cortex, and neurons of the sympathetic nervous system stimulate the adrenal medulla.
4. At all times, the anterior portion secretes ACTH, while the posterior portion secretes oxytocin.
Which combination of gland and hormone would be linked to winter hibernation and spring reproduction in bears?
1. pineal gland, melatonin
2. hypothalamus gland, melatonin
3. anterior pituitary gland, gonadotropin-releasing hormone
4. the pineal gland, estrogen
Which of the following stimulates the contraction of the uterine muscle?
1. ecdysone
1. glucagon
3. thyroxine
4. oxytocin
Which of the following endocrine structures is (are) not controlled by a tropic hormone from the anterior pituitary?
1. pancreatic islet cells
2. thyroid gland
3. adrenal cortex
4. ovaries
Which of the following hormones is incorrectly paired with its action?
1. oxytocin - stimulates uterine contractions during childbirth
2. thyroxine - stimulates metabolic processes
3. insulin - stimulates glycogen breakdown in the liver
4. ACTH - stimulates the release of glucocorticoids by the adrenal cortex
Abnormally reduced somatic growth (dwarfism) can be a consequence of decreased hormone secretion from the
1. kidneys.
2. pancreas.
3. posterior pituitary gland.
4. anterior pituitary gland.
In a lactating mammal, the two hormones that promote milk synthesis and milk release, respectively, are
1. prolactin and calcitonin.
2. prolactin and oxytocin.
3. follicle-stimulating hormone and luteinizing hormone.
4. luteinizing hormone and oxytocin.