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SCORPION-xisa [38]
3 years ago
6

The heads of myosin molecules contact the actin filaments when a muscle is relaxed. The heads of myosin molecules contact the ac

tin filaments when a muscle is relaxed. True False
Biology
1 answer:
julia-pushkina [17]3 years ago
6 0

Answer:The above statement is "false".

Explanation:

The following events take place during contraction-relaxation of a muscle:

•Action potential in T tubule activates voltage-sensitive receptors,which in turn trigger Ca ions release from terminal cisternae of sacroplasmic reticulum(SR) into cystol.

•Ca ions bind to troponin;troponin changes shape,removing the blocking action of tropomyosin;actin active sites is exposed.

•CONTRACTION; myosin heads alternatively attach to actin and detach,pulling the actin filaments toward the center of the sarcomere;using ATP in this process.

•removal of Ca ions by active transport into the SR after the action potential ends.

•RELAXATION occurs.Actin and myosin return back to its unbound state.

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The tetanus infection is considered to be a Droplet infection.

<h3>What is Tetanus?</h3>

Tetanus is a neurological disease which is characterized by the occurrence of spasms in the muscle.

Tetanus can be caused if initial care does not take place after the wound occurs and therefore, it is very important to immediately take care of the wound.

To treat the wound tetanus immunoglobulin and tetanus toxoids are given to the person, however, it is necessary to give the two injections using different syringes and at different sites, because the immunoglobulin can cause neutralization fo the toxoid.

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2 years ago
How is polyploid is used in the field of agriculture?
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Polyploidy is a major force in the evolution of both wild and cultivated plants. ... Some of the most important consequences of polyploidy for plant breeding are the increment in plant organs
5 0
3 years ago
Nonkeratinized stratified squamous epithelium can be found lining what area of the respiratory tract? alveoli nasal cavity bronc
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The answer is oropharynx. The reason for this type of epithelium in this region of the respiratory tract is due to its proximity to the esophagus. This means that this region of the respiratory tract is subject to abrasion by food passing down the esophagus. This epithelium is continuous with that of the esophagus.






5 0
4 years ago
Read 2 more answers
Some migratory birds are heterothermic, meaning they sometimes maintain a constant body temperature and other times allow their
eduard

Answer:

B. Birds allow their temperature drop in order to increase their production efficiency.

Explanation:

Most birds can drop the temperature a few centigrade degrees, while there are torpid birds capable of lowering much more. Birds can drop body temperature in response to environmental conditions. Bird species including, among others, swifts, hummingbirds and chickadees are capable of regulating body temperature during torpor state. There are different morphological and behavioral adaptative traits that enable birds to minimize the cost of thermoregulation. In the first place, epidermis surface allows heat loss to the environment, while arteries and veins in the legs help to retain heat in cold conditions.

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4 years ago
82. Your research team has recently identified a new gene and named short arm that when mutated causes the limb bud to cease gro
Aloiza [94]

Answer:

The creation of the limbs is carried out by AER and ZVP. AER stands for apical ectodermal ridge and ZVP stands for polarising activity line.

Explanation:

  • AER is responsible for the developmental progression in the distal to the anterior region and the ZVP is liable for the progressive advancement in the posterior to a backward region.
  • AER and ZVP are interconnected on one another in the secretion of a sonic hedgehog, which eventually assists throughout the hox speech to promote the growth of the arm.
  • The hypothesis that the new short-arm gene inhibits the effect of FGF (fibroblast growth factors) on AER can be tested and use a template of cultured cells.
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3 years ago
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