2 Muscle Tissues

Question 1

List the three single cell contractile units:

Answer 1

Myoepithelial cells

Pericytes

Myofibroblasts

Question 2

Name the contractile units found in glandular epithelium responsible for expulsion of secretions from glands:

Answer 2

Myoepithelial

Question 3

Contractile cells wrapped around the endothelial cells of capilliaries and venules are known as:

Answer 3

Pericytes

Question 4

What contractile units are an atypical combination of a fibroblast and smooth muscle?

Answer 4

Myofibroblasts

Question 5

What is the connective tissue which separates individual muscle fibres from one another?

Answer 5

Endomysium

Question 6

What is the layer of dense connective tissue continuous with the tendon and surrounding a muscle?

Answer 6

Epimysium

Question 7

What are bundles of numerous muscle fibres referred to as?

Answer 7

Fascicles

Question 8

What is the connective tissue which surrounds and separates fascicles?

Answer 8

Perimysium

Question 9

Thin filaments are formed by:

Actin

or

Myosin

Answer 9

Actin

Question 10

Thick filaments are formed by:

Actin

or

Myosin

Answer 10

Myosin

Question 11

How do electrical signals travel from the cell surface to the internal areas of the myofibres?

Answer 11

T-Tubules

Question 12

What ion is stored in the sarcoplasmic reticulum and is critical for muscle contraction?

Answer 12

Calcium

Ca²⁺

Question 13

A Motor Unit comprises of a single Axon, and what else?

Answer 13

All of the muscle fibres that are innervated by the axon

Question 14

Which cytoskeletal protein links actin filaments to the sarcolemma?

Answer 14

Dystrophin

Question 15

Muscular Dystrophy is a disease caused by mutation of a gene producing what protein?

Answer 15

Dystrophin

Question 16

Which neurotransmitter is used by motor neurons to trigger muscle contraction?

Answer 16

Acetylcholine

Question 17

What is the smooth muscle equivalent to troponin?

Answer 17

Calmodulin