Answer:
by the sarcoplasmic reticulum's calcium ion pumps
Explanation:
Rigor mortis or postmortem rigidity, is a state caused by chemical changes in the muscles that occur post mortem and cause the limbs of the corpse to stiffen.
This occurs because after death, there is no cellular respiration and consequently, no oxygen nor ATP (ATP is required for the muscle relaxation).
Calcium enters the cytosol after death because it is released due to the deterioration of the sarcoplasmic reticulum and due to the breakdown of the sarcolemma. Ca2+ ions activate the formation of actin-myosin cross-bridging necessary for the contraction. Muscles are unable to relax, because myosin heads continue to bind with the active sites of actin and there is no ATP to destabilize the myosin-actin bond.
Answer:
Oncogenes result from a mutation in proto-oncogenes.
Explanation:
- Protooncogenes control the growth and division of cells.
- The proteins encoded by proto-oncogenes include growth factors, growth factor receptors, transcription factors and signal transducers.
- They contribute to the transformation process by driving cell proliferation or reducing sensitivity to cell death.
- Several types of genetic and epigenetic changes convert these proto-oncogenes to oncogenes.
- Oncogenes arise due to the changes that increases the expression of proto-oncogenes .
- Oncogenes are one of the causes of cancers.
A proto-oncogenes can turn into oncogene by following ways:
- A point mutation such as deletion, insertion and substitution in the proto-oncogene can lead to formation of oncogenes.
- Chromosomal translocation may result in activation of proto-oncogene as seen in Burkitt's lymphoma.
- Insertion of a mobile genetic material such as retrovirus changes the gene expression, but leaves their coding sequence intact.
- Activation of proto-oncogene can also occur from reduplication and amplification of DNA sequence.
Answer:
it's d. Flexor carpi radialis
Explanation:
The other three are on the Posterior side. Extensor carpi ulnas should also be spelled ( Extensor carpi ulnaRIs )
Answer:
Cerebellum
Explanation:
According to my research on studies conducted by various neurologists, I can say that based on the information provided within the question the doctors will likely find Christy's problem in the Cerebellum which is located in the Hindbrain. The Cerebellum is responsible for coordinates voluntary movements such as posture, balance, coordination, and speech, resulting in smooth and balanced muscular activity. A problem with the Cerebellum can impair movements similar to what Christy is experiencing.
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The answer to this would be a SMALL INTESTINE. The small intestine is the major site for the absorption of nutrients. Nutrients include different vitamins and minerals that are extracted from the foods that we eat. How absorption is possible in this site is the presence of e<span>pithelial cells of the villi. Hope this helps.</span>
