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4367447
HUMAN RESPONSES
Description
Revision for biology A2
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ocr
biology
human responses
old spec
Mind Map by
ize_paul
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Created by
ize_paul
about 9 years ago
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Resource summary
HUMAN RESPONSES
THE BRAIN
Cerebral Cortex
Sensory areas
Assosiation areas
Motor areas
Coordinated motor responses
NERVOUS SYSTEM
Responding to the environment
Nervous system Components
Central Nervous system
Peripheral
Sensory
Motor
AUTONOMIC
'self governing'=
Homeostasis
Controlling heightened responses
Occur in 2 ways
SYMPATHETIC
PARASYMPATHETIC
Somatic
COORDINATED MOVEMENT
antagonistic muscle pair
SYNOVIAL joint e.g Elbow
synovial fluid=lubricant
eases movement of bones at joint
Control of cotraction
Nervous system controls muscle action
Motor neurones connected to muscle cells at neuromuscular junction
MUSCLES
Muscle Structure
cells elongated to form fibres
Filaments made of ACTIN and MYOSIN
INVOLUNTARY (SMOOTH)
CARDIAC
VOLUNTARY (SKELETAL)
SLIDING FILAMENT MODEL
Sacromere
Span from one Z-line to next
Protein filaments in muscle cells
Thin
Thick
POWER STROKE
1. Formation of cross bridge
2. Heads bend, thin filament pulled, ADP+Pi released
3. Cross bridge broken, new ATP attaches to head
4. Head group moves backwards, ATP -> ADP+Pi
Calcium Ions
ATP
Maintanance of supply
1. Aerobic respiration mitochondria
2. Anaerobic respiration in sarcoplasm
Transfer from creatine phosphate in sarcoplasm
MUSCLES, NERVES AND HORMONES
Fight or Flight
Controlled by sympathetic nervous system
physiological changes
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