Histology

Question 1

Describe the structure of a sarcomere

Answer 1

• Under contraction, dark band does not shorten, only H and I band shortens

Question 2

What are the three types of skeletal muscle fibres and describe them.

Answer 2

Type I - slow contracting, oxidative metabolism, abundant mitochondria & myoglobin; resistant to fatigue/produce lesser force

Type IIa - intermediate

Type IIb - fast contracting, anaerobic metabolism, few mitochondria & less myoglobin; fatigued easily/produce greater force

Question 3

What is lacuna?

Question 4

What is the extracellular matrix component of hyaline cartilage?

Answer 4

75% water
25% organic material (60% type II collagen - a 3D meshwork + 40% proteoglycan)

Question 5

Compare and contrast three types of cartilage

Question 5

Describe and compare Haversian system and Volkmann’s canal in compact bone

Question 5

Describe and contrast structure of compact and trabecular bones

Question 6

Describe the four types of cells of bones