Fluid filled sacs in the knee are specifically called Bursa or Bursae. Bursae is plural for Bursa.
A bursa is a closed fluid filled sac that function as a gliding surface to reduce friction between tissues of the body. Knee bursitis occurs when there is irritation or inflammation in one one of the knee bursa. The procedure of removing fluid-filled sac is called bursectomy. When the bursa become infected with bacteria, this condition is called septic bursitis.
Answer:
The movement of proteins and enzymes within a cell is facilitated by intracellular receptors.
Explanation:
Proteins and enzymes (which also are proteins) move inside the cell through intracellular receptors. These receptors are proteins capable of binding other molecules such as proteins and hormones in order to transport them to different cellular locations. Thus, intracellular receptors are key players in signaling pathways that trigger signaling events to regulate a particular function, for example, activating gene expression by transporting proteins to the nucleus.
Telomerase activity is controlled during development and is extremely low in somatic (body) cells, virtually undetectable. These somatic cells age because they do not frequently use telomerase.
- Telomeres are repetitive sections at the very ends of chromosomes that are present in a variety of eukaryotic species, including humans and unicellular protists.
- Each round of DNA replication wears down a little portion of the telomeres, which serve as caps to safeguard the interior chromosomal regions.
- Most somatic (body) cells do not typically have telomerase activity, but certain adult stem cells and germ cells—the cells that produce sperm and eggs—have.
- Adult germ cells, tumor cells, and fetal tissues all contain telomerase. Telomerase activity is controlled during development and is extremely low in somatic (body) cells, virtually undetectable. These somatic cells age because they do not frequently use telomerase.
learn more about telomerase here: brainly.com/question/14213408
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Blade
Thin, flattened section of a plant leaf that collects sunlight
Petiole
Thin stalk by which a leaf blade is attached to a stem
Mesophyll
Specialized ground tissue that makes up the bulk of most leaves; performs most of a plant's photosynthesis
Palisade Mesophyll
Layer of tall, column-shaped mesophyll cells just under the upper epidermis of a leaf
Spongy Mesophyll
Loose tissue beneath the palisade layer of a leaf
Stoma
Opening in the underside of a leaf that allows carbon dioxide and oxygen to diffuse into and out of the leaf
Guard Cell
Specialized cell in the epidermis of plants that controls the opening and closing of stomata by responding to changes in water pressure
Transpiration
Loss of water from a plant through its leaves
(Got this from my textbook so here)
