STUDY NOTES FOR BIOLOGY CHAPTER 13 – NEUROBIOLOGY AND BEHAVIOUR

Expert teachers have specially curated these notes to simplify and enlighten concepts given in IB Biology HL. The notes are comprehensive and are sufficient to study the chapter in-depth, and one need not look for other resources beyond the notes provided on our website, which can be accessed for free. The notes for Neurobiology and behavior IBDP HL are available on our official website and can be downloaded for free. You are one click away from obtaining all that you need to score well in IB Biology HL.

The material made available on Tychr’s website is available for all IBDP subjects. It is specially curated after an extensive amount of effort to ensure that the notes are in consonance with the IB curriculum and are an amalgamation from various textbooks prescribed by the IBO. Students often face a challenge understanding concepts, especially concepts that are new and tricky. These IB Biology Notes will help the student cover the chapter on Neurobiology and behavior entirely while explaining each concept in a detailed and easy way.

Biology IBDP is a part of group 4 Sciences of the IB Curriculum. The IBDP Biology course is the study of living organisms and their interaction with their surroundings. Students who opt for this course can better understand physiology, their environments, genetics etc.

In Biology, the interaction of these approaches forms the basis of a holistic and integral approach to understanding biological processes and life as dynamic and complex phenomena; these enable students to understand the diversities and commonalities between living beings and environments.

The interaction of these approaches focuses on the CORE areas of Cell Biology, Molecular biology, Genetics, Ecology, Evolution and biodiversity, and human physiology.

This unit deals with the formation of the neural tube and the brain and how the senses respond to stimuli. Neurobiology is the stream of science that deals with the study of the complex information processing system that includes the brain and the nervous system. Neural development begins with the formation of a neural tube which will give rise to the brain and the spinal cord. Neurogenesis is the formation of neurons by differentiation of neuroblast. Then we move on to plasticity, which refers to the brain’s ability to adapt and reform accordingly. Brain develops from the anterior end of the neural tube.

The brain and spinal cord are a part of CNS(central), whereas ANS(autonomic), ES(enteric) and SNS(somatic) are parts of PNS. ANS has two subdivisions sympathetic (flight or fight) and parasympathetic(rest and relax). Then we discuss brain death when the movements, respiration and reflexes are absent, EEG is flat, and CBF shows no activity. Heartbeat and spinal reflexes may persist because they are not entirely under brain control. The cerebral cortex is the largest part of the mature brain made up of a lot of gyri and sulci.

Alternatively, we also talk about the types of receptors(mechano, Thermo, chemo, photo), eye and ear. Animals have both innate and learned behaviours (learnt by imprinting, conditioning and learning). In the end, we discuss neuropharmacology, the neurotransmitters involved and the drugs that modulate them. We also discuss ethology, i.e. the study of animal behaviour briefly. 


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