Chapter 20 : Locomotion and Movement Flashcards
how does movmene ttake place in amoeba?
protoplasmic streaming
micro filaments are also used in the movmenet
How does movemnet take place in paramoecium ?
cillia
How and wehre does the paramoecium take the food inside its body / cell?
with the help of cillia it diverts the food into the cytopharynx
how does hydra move andcapture food?
with teh helpp of tentacles
All locomotions are movemnet but all movements are not locomotion?
true
What are the three types of movemnet shown in humnan bodies?
amoeboid : amcrophage and leukocytes
cilliary : cilliated epithelium , tracheaae, fallopian tube
muscular : tingue , limbs etc
from which germ layer does the muscles originate from?
mesoderm
What are the types of muslces on the basis of location? Where are they found?
skeletal ( assocaited to skeletal system)
visceral (inner walls of hollow organs)
cardiac muscles ( present in the heart)
What is fascia made up of ?
collagenous tissue
What acts as a store house of Ca++ ions in teh muscle cell?
sarcoplasmic reticulum
What is the light band and the dark band composed of?
light ; actin (I band )
dark : myosin (A band )
Which is caleld the thick and thin filaments?
thick : myoson
think : actin
What is present in the middle of an I band?
Z line that connect the actin fibres
What is presnet in the middle of the A band?
M line
What is the funcitonal unit of the muslce?
hte region between the two Z line is caleld ht sarcomere and is the funcitonal unit
What is Hzone>
the area in the middle where there is no overlap of actin and myosin is called H zone
What are F actin and G actin?
F actin is made up of G actin
What are the two other protien presnet on the actin filament?
tropnin and tropomyosin
What masks the active bnding sirtes of myosin on actin ?
troponin
but in reality the troponin binds to the tropomyosin which binds to the actin
What is the myosin composed of ?
it is composed of meromyoson
What are the components of meromyoson?
HMM ( head and cross arm)
LMM
What is present in the head of a meromyosin??
ATPase enzyme and binding site for ATP and active sites for actin
Which theory shows the contraction of muscles?
sliding filaments theory
What initiates the contraction of hte muslces?
a signal sent from teh CNS
What is motor unit
neuron and the muscles together are called motor unti
What is the motor end plate? ad what is it also knowns as?
the juncito between the muscle and the neuron is called the motor end plate and is also known as the neuromusclar junction q
What leads to teh unmaking of the actin filaments?
increase in Ca ions