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Human Responses To The Environment > Reflex Arc > Flashcards

Reflex Arc Flashcards

1
Q

What is the purpose of rather reflex arc?

A

Bring about a reflex action

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2
Q

What is a reflex action?

A

A fast automatic response by an effector organ (a muscle) or a gland to a stimulus received by a receptor organ.

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3
Q

What are the 2 types of reflexes?

A

Somatic and Automatic reflexes

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4
Q

What is the function of a somatic reflex?

A

Activate skeletal muscles

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5
Q

What is the function of an automatic refelx?

A

Activate smooth or cardiac muscle and glands

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6
Q

What are the 5 essential component of a somatic reflex arc

A 
Receptor e.g skin
Sensory Neuron
Connector neuron
Motor neuron
Effector e.g muscle
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7
Q

What is the function of a receptor?

A

Responds to stimuli and generates impulses

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8
Q

What is the function of a sensory neuron?

A

Carries impulses to CNS

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9
Q

What is the function of a connector neuron?

A

Acts as reflex centre

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10
Q

What is the function of a motor neuron?

A

Carries impulses to an effector organ

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11
Q

What is the. Function of an effector?

A

Brings about change

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12
Q

Where are reflex centres situated?

A

Brain and spinal cord

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13
Q

What is the function of brain for in reflex centres?

A

Controls reflexes such as sneezing , breathing, blinking

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14
Q

What is the function of spinal cord in reflex centres ?

A

Control primitive reflexes such as knee jerk.

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15
Q

What is the function of a reflex arc?

A

Receptors respond to stimulus, to generate impulses in sensory neurons,
Impulses are conducted along sensory neurons to grey matter in spinal cord
Here impulses make synaptic contact with connector neurons act as reflex centres.
Then make synaptic contact with motor neurons, which conduvpct them to effector.
The effector brings about a response
Impulses are conducted to cerebral cortex of brain - interpreted as pain.

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16
Q

What is important about reflex arcs?

A
  1. Enable body to respond quickly to a stimulus.

2. Provide inborn safety mechanisms that PROTECT body from danger

17
Q

What is a reflex arc?

A

A neutral pathway filled by impulses from a receptor to an effector

18
Q

What are some examples of reflexes?

A

Sneezing
Blinking
Yawning
Coughing

19
Q

How are synapses formed?

A

With The gap that separates neurons and adjacent membranes

20
Q

What is a synapse?

A

The place where a nerve impulse passes from an axon terminal to a neuron, muscle cell or a gland cell.

21
Q

How do Impulses travel across a synapse?

A

Nerve impulse reach terminal branches, vesicles burst, release neurontransmitters to diffuse across gap

Neurontransmitters carry impulses across gap

22
Q

Why are synapses important?

A
  1. Make sure impulses flow in ONE DIRECTION only
  2. Allow dispersal of impulses
  3. Allow filtering out of unnecessary stimuli

Human Responses To The Environment (10 decks)

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