Structure of the Neuromuscular Junction

Question 1

What do end bulbs contain?

Answer 1

Vesicles containing acetylcholine

Question 2

How many receptors do the motor end plates contain?

Answer 2

30 million Ach receptors

Question 3

What are transverse tubules?

Answer 3

Invigilators of the sarcolemma into the centre of the cell

Question 4

What are the transverse tubules filled with?

Answer 4

Extracellular fluid

Question 5

What do transverse tubules do?

Answer 5

Carry action potentials into cells

Question 6

How are mitochondria lined up in transverse tubules?

Answer 6

Mitochondria lie in rows throughout the cells near muscle proteins with use of ATP during contraction

Question 7

What is covered by the sarcolemma?

Answer 7

Skeletal muscles with fibres

Question 8

What is the sarcolemma?

Answer 8

Skeletal muscles containing fibres

Question 9

What does sarcolemma contain?

Answer 9

Sarcoplasm and T-tubules

Question 10

What is the sarcoplasm?

Answer 10

Muscle cell cytoplasm

Question 11

What does the sarcoplasm contain?

Answer 11

-Large amounts of glycogen for energy production
-Myoglobin for oxygen

Question 12

What is the sarcoplasmic reticulum?

Answer 12

System for tubular sacs

Question 13

What is the sarcoplasmic reticulum similar to?

Answer 13

Smooth ER

Question 14

What is the function of the sarcoplasmic reticulum?

Answer 14

-Stores Ca²⁺ in a relaxed muscle
-Release of Ca²⁺ triggers muscle contraction