38. The pathway that carries information critical to create and maintain circadian rhythms starts in the and activity of the structure at the end of the pathway is modified
Added by Angela M.
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The pathway begins in the **retina**, where light information is detected. Show more…
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Which is true about the endogenous clock? (pick all that apply) It is a feature of the suprachiasmatic nucleus in the hypothalamus. It is characterized by increased cell activity during the day. Nocturnal animals (most active at night) need the clock less to regulate activity. Cells from the retina have a direct link to the clock. Pick and explain (briefly) what you think is the most important feature of each sleep stage (a sentence for each stage).
Suman K.
Fipna waves are characteristic of REM sleep, while delta waves are characteristic of NREM sleep. Stage one sleep is characterized by relaxed wakefulness, while stage two sleep is characterized by dominant surfers. The SCN produces circadian rhythms by modulating blood pressure and body temperature, rates of action potentials and levels of protein synthesis, action potential velocities, and rates of axonal myelination and dendritic growth. The SCN functions as a third eye in primitive proto-chordates, but in mammals, it influences mood and sleep through the synthesis of oxytocin in the medial forebrain bundle. The anterior septum functions as a third eye in primitive proto-chordates, while vasopressin functions in mammals. The optic chiasm is associated with serotonin, and the pineal gland is associated with melatonin. One of the primary functions of central pattern generators is to produce repetitive rhythmic patterns of movement. They do not cause the pupils to constrict in mammals.
Adi S.
In the retina: a) Rods are most concentrated in the center of the retina, while cones are distributed throughout the periphery of the retina. b) Light travels through several cell layers before it reaches the photoreceptors (rods and cones) located at the back of the retina. c) Pigmented epithelium reflects light to scatter it around the retina. d) Not all retinal cells can generate action potentials. e) Light interacts with retinal cells in this order: photoreceptor cells, bipolar cells, then retinal ganglion cells. Retinofugal projections – also known as pathways moving from the retina – can follow the traditional pathway to the visual cortex, but can also have offshoots to control other functions related to light perception and vision, including circadian rhythm function, pupillary reflexes, and movement of eye muscles to compensate for head movement in the vestibulo-ocular reflex. Which brain region is responsible for receiving retinal information regarding circadian rhythms? a) Striate cortex of the occipital lobe b) Superior colliculus of the tectum (midbrain) c) Lateral geniculate nucleus of the thalamus d) Suprachiasmatic nucleus of the hypothalamus
Keemin L.
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