muscle tissue

Question 1

muscle tissue

Answer 1

bundles of reddish fibres with contractibility as the main characteristic
develops from the mesoderm of an embryo

Question 2

two groups of muscle tissue

Answer 2

voluntary and involuntary muscle tissue

Question 3

voluntary muscles (cross-striated muscle tissue)

Answer 3

controlled by a conscious decision
cross-striated appearance
consist of long cylindrical fibres bound together in bundles

Question 4

nuclei in cross-striated muscle tissue

Answer 4

several nuclei can be found in one muscle fibre
the fibres are multinucleate
oval-shaped nuclei are situated just below the sarcolemma

Question 5

fibres in cross-striated muscle tissue

Answer 5

consists of groups of fibrils with darker and lighter bands of the fibril correlate, giving a fibre its characteristic striated appearance
muscle fibres are bound into larger bundles, in their turn, form a muscle

Question 6

bundles

Answer 6

enclosed by a connective tissue membrane called the perimecium

Question 7

epimecium

Answer 7

the whole muscle is enclosed by the epimecium

Question 8

motor neurons

Answer 8

muscle fibres are served by motor neurons
this promotes coordinated movement

Question 9

sarcolemma

Answer 9

the membrane that cross-striated muscle fibres are enclosed by

Question 10

blood vessels

Answer 10

occur in the connective tissue surrounding larger muscle bundles and in the muscle
capillary blood vessels bring individual fibres in contact with blood

Question 11

when muscles contract

Answer 11

they become shorter and thicker

Question 12

when muscles relax

Answer 12

they become longer and thinner

Question 13

muscle tone

Answer 13

voluntary muscles (and smooth muscles) are always in a slightly tense mode
essential to maintain the shape of organs, posture, and ability to sit/stand.

Question 14

involuntary muscle tissue (smooth muscle tissue)

Answer 14

functions automatically
not controlled by a conscious decision

Question 15

smooth muscle fibres

Answer 15

slender, spindle-shaped cell
stimulated by nerves of the autonomic nervous system

Question 16

where is smooth muscle tissue found

Answer 16

mostly found in the walls of the digestive tract
glands of the digestive tract
bladder wall
walls of the trachea and bronchi
walls of the blood vessels
skin
reproductive organs

Question 17

peristalsis

Answer 17

smooth muscle fibres are sensitive to the contractions of adjacent cells
this sensitivity is responsible for the wave-like contractions along the digestive tract

Question 18

cell in smooth muscle

Answer 18

single oval-shaped nucleus
situated more or less in the middle of the cell
no striation
can occur singly but more often in groups

Question 19

cardiac muscle tissue

Answer 19

involuntary muscle tissue
slightly striated appearance
continuous network of bundles that divide and recombine

Question 20

prominent transverse bands

Answer 20

divide the tissue into shorter units

Question 21

cell units

Answer 21

research has indicated that transverse bands form real separation between cell units
each cell unit has a centrally located, round nucleus

Question 22

autonomic nervous system/automatism

Answer 22

the autonomic nervous system innervates cardiac muscle tissue but also has automatism as a characteristic

Question 23

automatism

Answer 23

the performance of actions without conscious thought or intention