{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Unit 3-Lecture 2.pptx - Unit 3-The Heart Lecture 2-Cardiac...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
Unit 3-The Heart Lecture 2-Cardiac Function
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Histology of Cardiac Muscle Compared to skeletal muscle fibers, cardiac muscle fibers are shorter in length, larger in diameter, and squarish rather than circular in transverse section. They also exhibit branching. Fibers within the networks are connected by intercalated discs, which consist of desmosomes and gap junctions
Background image of page 2
Histology of Cardiac Muscle Cardiac muscles have the same arrangement of actin and myosin, and the same bands, zones, and Z discs as skeletal muscles. We will look at these in detail when we study the muscular system They do have less sarcoplasmic reticulum (SR) than skeletal muscles and require Ca +2 from extracellular fluid for contraction. As we will see when we examine muscle tissue, the SR stores calcium ion, which are essential to the process of contraction
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
4 Cardiac Muscle Histology Branching, intercalated discs with gap junctions, involuntary, striated, single central nucleus per cell
Background image of page 4
Heart muscle:
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}