The Bases of Human Behaviour Flashcards
most developed organisms among all creatures on this Earth
Homo-sapiens aka humans
What makes humans different from other species?
- ability to walk upright
- larger brain size (relative to body weight)
- proportion of specialised brain tissues
The uniqueness of individuals results from the interaction of their ________ and ____
genetic endowments and environmental demands
Biologists believe that species have evolved into their _____ from their _____
present forms, pre-existing forms
Characteristics of modern human beings developed some 200000 years ago as a result of their___
continuous interaction with their environment
____ refers to gradual and orderly biological changes that result in a species from their pre-existing forms in response to the changing adaptational demands of their environment
Evolution
__________ and ____changes that occur due to the evolutionary process are so slow that they become visible after hundreds of generations
physiological, behavioural
Evolution occurs through the process of _____
Natural selection
When repeated generation after generation natural selection leads to the ____ of new species that are more effectively adapted to their particular environment
evolution
3 imp features of modern human beings that differentiate them from their ancestors
(i) a bigger and developed brain with increased capacity for cognitive behaviours (like perception, memory, reasoning etc)
(ii) ability to walk upright on 2 legs
(iii) a free hand with a workable opposing thumb
Our behaviours are ____ and more developed than those of other species because we have got a large and _____ brain
highly complex, highly developed
what are the 2 evidences for human brain development?
(i) the weight of the brain =2.35% of total body weight
i. e, highest among all species (elephant=0.2%)
(ii) human cerebrum is more evolved than other parts of brain
___lead to biological and behavioural changes over a long period of time
Environmental demands
An important determinant of our behaviour is the _______ that we have inherited from our ancestors in the form of developed body and brain
Biological structures
Many children develop mental retardation and other abnormal symptoms due to transmission of a ____ from the parents
Faulty gene
____is the basic unit of a nervous system
Neuron
______are specialised cells, which possess the unique property of converting various forms of stimuli into electrical impulses
Neuron
____are specialised for reception, conduction and transmission of information in the form of electrochemical signals
Neurons
Neurons receive information from ____ or from other adjacent neurons, carry them to the _________ and bring _____ from the central nervous system to the ____
sense organs, central nervous system(brain and spinal cord), motor information, motor organs (muscles and glands)
_________ number of neurons are found in the nervous system
12 billion
what are the 3 fundamental components of neuron?
Soma, axon, dendrite
The ___ or ____ is the main body of the nerve cell
Soma , cell body
the soma contains the __ of the cell as well as other structures common to living cell of all types
Nucleus
The genetic material of the neuron is stored inside the ____ and it becomes actively engaged during ____ and ____
Nucleus, cell reproduction and protein synthesis
The soma also contains most of the ____ of the neuron
cytoplam(cell-fluid)
______are the branch like specialised structures emanating from the soma
dendrites
________are the receiving ends of a neuron
dendrites
_______function is to receive the incoming neural impulses from adjacent neurons or directly from the sense organs.
dendrites
on dendrites are found _____ which become active when a signal arrives in electrochemical or biochemical form
specialised receptors
the signals received by the speacialised receptors are passed on to ____ and then to ____ so that information is relayed to another neuron or muscles
soma, axon
The axon conducts information along it’s length which can be _____ in the spinal cord and _____ in the brain
Several feet, less than a millimeter
At the ______ the axon branches out into small structures called _____
terminal point, terminal buttons
________have the capability for transmitting information to another neuron, gland and muscle
terminal buttons
neurons generally conduct information in one direction, from the ____ through ____and _______to ____
dendrites, soma, axon, terminal buttons
conduction of information from one place to another in the nervous system is done through nerves which are bundles of ____
axons
2 types of nerves are
sensory nerves(afferent) and motor nerves(efferent)
______nerves carry information from sense organs to central nervous system
sensory(afferent)
______nerves carry information from central nervous system to muscles/glands
motor(efferent)
A ___nerve conducts neural commands which direct, control and regulates our movements and other responses
motor
information travels within the nervous system in the form of a ___
nerve impulse
_______is a sudden change in the electrical potential of the surface of a neuron
nerve potential
The strength of the nerve impulse does not depend on the strength of the stimulus that started the impulse. true or false
true
Nerve fibres work according to the ______
all or none principle.
- which means they either respond completely or do not respond at all
- strength of the nerve impulse remains constant along the nerve fiber
Information is transmitted from one place to another within the nervous system in form of a ______
Neural/nerve impulse
A single neuron can carry a neural impulse up to a distance covered by _________
the length of its axon
When a neural impulse is to be conducted to a distant part of the body, a ______ participate in the process.
number of neurons (one neuron faithfully relays the information to a neighbouring neuron)
The ____Tip of a preceding neuron makes functional connections or ___with dendrites of the other neuron
axon, synapse
A neuron is never physically connected with another neuron; rather there is a small gap between the two known as _____
synaptic cleft
the neural impulse from one neuron is transmitted by a _________ process to another neuron
complex synaptic transmission
The conduction of neural impulse in the axon is _____ while the nature of synaptic transmission is____
electrochemical, chemical (the chemical substances are known as neurotransmitters)
Our _____ structures play an important role in organisation and execution of behaviour
biological
the _______system and ____system work together in giving a shape to human behaviour and experience
nervous, endocrine
______nervous system is the most complex and most developed among all living creatures
human
The nervous system functions as a ____
(a) whole
(b) part
(c) depends
(a)whole
Based on location the 2 division of nervous system are
CNS, PNS
The part of the nervous system found inside the hard bony cases is ____
CNS
-brain and spinal cord are the organs of this system
the parts of the nervous system other than CNS are placed in the _____
PNS
PNS can be classified into
somatic nervous system and autonomic nervous system
_______nervous system is concerned with voluntary actions and ______nervous system is concerned with involuntary actions
somatic(control of skeletal muscles)
autonomic (control of internal organs)
The ____ is composed of all the neurons and nerve fibres that connect the ___ to the rest of the body
PNS, CNS
The autonomic nervous system is further divided into _____ and _____systems
sympathetic, parasympathetic
The _____ provides information to the ___ from sensory receptors and relays back motor commands from the brain to the muscles and glands
PNS, CNS
The somatic nervous system consists of two types of nerves; _______ and ______
Cranial nerves and spinal nerves
There are ______sets of cranial nerves which either emanate from or reach different locations of the brain
12
There are 3 types of cranial nerves
sensory, motor, mixed
_____nerves collect sensory information from receptors of the head region and carry them to the brain
Sensory
The ____nerves carry motor impulses originating from brain to muscles of the head region
Motor
Movements of the eyeballs are controlled by _____nerves
motor cranial