10 Questions
What is the structural and functional unit of a skeletal muscle?
Sarcomere
In the relaxed state, what is the average length of each sarcomere?
2 to 3 μ
Where are the myosin filaments situated?
'A' band
During muscle contraction, which filaments slide on the myosin filaments towards the 'H' zone?
Actin filaments
What is the middle of the 'A' band where there is a light area called 'H' zone?
'M' line
What is the main protein in plasma and its function?
Albumin, regulates colloidal osmotic pressure of blood
Which cells are the most abundant in vertebrate blood?
Red blood cells
What is the main function of red blood cells (RBCs)?
Facilitate oxygen transport
When is vertebrate blood bright red?
When its hemoglobin is oxygenated
What constitutes 55% of blood fluid and contains proteins, glucose, mineral ions, and hormones?
Plasma
Study Notes
Skeletal Muscle Structure
- The structural and functional unit of a skeletal muscle is the sarcomere.
Sarcomere Characteristics
- In the relaxed state, the average length of each sarcomere is approximately 2.5 micrometers.
- Myosin filaments are situated in the sarcomere, making up the thick filaments.
Muscle Contraction
- During muscle contraction, the actin filaments slide on the myosin filaments towards the 'H' zone.
'A' Band and 'H' Zone
- The middle of the 'A' band has a light area called the 'H' zone, which is devoid of actin filaments.
Blood Plasma
- The main protein in plasma is albumin, which functions to regulate osmotic pressure and transport nutrients.
Blood Cells
- The most abundant cells in vertebrate blood are red blood cells (RBCs).
Red Blood Cell Function
- The main function of red blood cells (RBCs) is to transport oxygen from lungs to tissues and carbon dioxide from tissues to lungs.
Blood Color
- Vertebrate blood is bright red when it is oxygenated.
Blood Fluid Composition
- The blood fluid, which constitutes 55% of blood, is composed of proteins, glucose, mineral ions, and hormones.
Test your knowledge of skeletal muscle physiology with this quiz covering the structural and functional aspects of the sarcomere, the basic unit of skeletal muscle. Topics include sarcomere extent, function, and more.
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