Cell membranes serve as barriers and gatekeepers. They are semi-permeable, which means that some molecules can diffuse across the lipid bilayer but others cannot.
Answer:
The correct answer will be option- B.
Explanation:
Synovial fluid is a clear slippery fluid which is present in the synovial cavity.
The synovial fluid helps the nourishment as it provides nutrients to the and oxygen to the hyaline cartilage of the bones as well as the lubrication of the cartilage surfaces due to the viscous nature like oil which lubricates the piston.
This smooth surface facilitates the smooth and painless movements between the bones, therefore, the Option-B is the correct answer.
The names of the respiratory structures involved include the following: nasal cavities (or oral cavity) > pharynx > trachea > primary bronchi (right & left) > secondary bronchi > tertiary bronchi > bronchioles > alveoli.
<h3>What is respiration?</h3>
Respiration is defined as the oxygenation of blood through the intake of oxygen and the removal of carbon dioxide.
The pathway of oxygen gas molecule from the surrounding air through the respiratory system to the blood include respectively the following:
- Nasal cavities (or oral cavity): This has a direct association with the outside oxygen from the environment.
- pharynx: This so also called the throat.
- trachea: This is also called the wind pipe.
- Primary bronchi (right & left): This divides from the trachea to form two bronchi.
Learn more about respiration here:
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Answer:
Explanation:
Firstly, let us break down the components:
A cilia is a hair-like structure positioned on a tissue for locomotive purposes
Epithelium is a type of tissue
Therefore, a ciliated epithelium is a kind of tissue that contains hair-like structures called cilia for locomotion. They can be found in our respiratory tracts lining, the fallopian tube of human females, brain etc. where they mainly perform the function of moving particles.
They help move foreign particles like dust from our respiratory tracts, they help move the egg from the ovary to the uterus of women, they also move cerebral spinal fluid in the brain.
Ciliated epithelium contains goblet cells, that secretes mucous to provide the moist medium for locomotion
