Question

Describe 3 scenarios by which circadian rhythms may be disrupted.

1. One answer is a change in circadian rhythms due to a change in stimuli.

2. One answer is a change in circadian rhythms due brain damage to a particular group of axons. (describe the pathway)

3. One answer is a change in circadian rhythms due the inhibition of the synthesis of particular proteins. (name which proteins would be affected and what is the brain area where this inhibition would be happening )

Answer 1

2. A group of cells in the hypothalamus that respond to light and dark signals.The circadian  biological clock is controlled by a part of the brain called the Supra chiasmatic Nucleus (SCN), A group of cells of hypothalamus

pathway

It takes palce in 2 senarios

1.In presence of light

2. In the absence of light

The clock gene proteins PER 1 and PER 2 are responsibel for circadian rhythms

  

HYPCR POLARISED BY PRESENCE OF LIGHT PIGMENT MELANOPSIN (RODS & ICONS ) PRESENCE OF LIGHT PHOTOSEAS ME RETINAL "GAGLION CELYI RETINA ABSENCE OF unाम ОРТ С NERVE RHT ISCH Ето иҮРотеніс TRACT MELATONN IPUN SG - Pineal gland lineal gland ③ PHOTOGANGLION CELLS DEPOLARISE OF BY PRESENCE LIGHT Opal NERVE — ABSORB 414HT" fan PrN - PARA VENTRICULAR NULEL scq - SUPERIOR CERVICAL GANGLION,