Question

1. Which of the following structures is associated with the diaphysis of a long bone?

      
increased area of vascularity

       
only area of spongy bone

       
Marrow cavity

       
Area of tendon attachment

       
The head

2. What is the unique structure found in veins that makes returning blood to the heart possible?

      
One way valves

       
Muscular walls

       
Anastomoses

       
Thick, nonpliable walls

       
Rings of smooth muscles

3.

The Fluid Mosaic Bilayer is a descriptive hypothesis to describe the structure of:

      
The membranes surrounding organs

       
The cell membrane

       
The nuclear envelope

       
Mitochondria

       
Strand of mRNA

Answer 1

Answer

1. Option C) Marrow caivty

• Marrow cavity is also known as medullary cavity and is lined by endosteum.
• It is located in the diaphysis of long bone.
• It contains bone marrow and is the site for production of blood cells.

2. Option A) One way valves

• Veins return deoxygenated blood to the heart.
• The blood pressure is lows in veins compared to the arteries.
• In order to ensure one way blood transport, veins posses valves that prevent backflow of the blood.

3. Option B) The cell membrane

• The structure of cell membrane is describe by fluid mosaic model.
• Cell membrane is made up of phospholipids that permit entry of lipid soluble molecules but prevent water soluble molecules from entering the cell.