Answers
The skeletal muscle, responsible for voluntary contraction is composed of 1) Myofilaments 2) Myofibrilles 3) Muscle fibers 4) Muscle (from the left to the right in the image)
What is the composition of the skeletal muscle?
The elements composing the skeletal muscle are,
Myofilaments ⇒ Actine and miosineSarcomere ⇒ It is the functional unit with the contractile apparatus. Composed of the Z band, A and I bands, and H zone.Myofibrilles ⇒ They have the Functional unitsMuscle fibers ⇒ Surrounded by endomysiumFascicle ⇒ Group of fibers surrounded by perimysium.Muscle ⇒ Group of fascicles surrounded by epimysium.The sarcomere is the contractile unit in a skeletal muscle. The thick myosin myofilaments are located in the central region of the sarcomere, which corresponds to the A band.
Thin filaments united to the Z lines, extends to the interior of the A band until they reach the border of the H band.
The I band is formed solely of thin actin filaments, belonging to two sarcomeres adjacent to a Z line.
When the muscle contracts, the muscular fiber gets shorter and thicker due to the reduction in length of the sarcomere.
The H line and the I band get shorter. The Z lines get closer to the A band, meaning that they get closer to each other. The A band keeps constant in length.This change is produced by movement mechanisms that involve a change in the relative position of actin and myosin filaments.For a better understanding about muscle contraction, look at the attached files.
From the left to the right,
1) Myofilaments
2) Myofibrilles
3) Muscle fibers
4) Muscle
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Related Questions
Examine the Role of Lipids in Your Body Fat around organs phospholipids
Answers
Lipids are organic compound that are insoluble in water.
Lipids are derive from and give eg of lipids?
Lipids are derivative of fatty acids the example of lipids are oils, wax and steroids.
Role of lipids are:
1)They fuctions as store house of energy.
2) They are important signalling molecules
3) They serve as structural components of cell membranes.
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Phospholipids are essential structural components of brain and nervous tissue, of membranes throughout body tissues, and of lipoproteins—the runners of cholesterol and fats in the blood.
What is the role of fat and lipids in the body?
Within the body, lipids serve as an energy reserve, control hormones, transmit nerve impulses, cushion vital organs, and transport fat-soluble nutrients. Fat in food serves as an power source with high caloric thickness, adds texture and taste, and donates to satiety.
What are 4 functions of lipids in the body?The Roles of Lipids in the Body
Storing Energy. The extra energy from the food we eat is digested and incorporated into adipose tissue, or fatty tissue.Handling and Signaling. Insulating and Protective.Helping Digestion and Increasing Bioavailability.To learn more about Lipids , refer
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The Y chromosome is much smaller than the X chromosome. What does this mean?
A. The Y chromosome takes up much more space than the X chromosome.
B. The X chromosome has more genes than the Y chromosome.
Answers
Answer:
A. The Y chromosome takes up much more space than the X chromosome
WILL GIVE BRAINLIEST
An approach that uses passive solar heating instead of electricity for businesses and homes is known as
daylighting
weatherizing
green roofing
cool roofing
Answers
An approach that uses passive solar heating instead of electricity for businesses and homes is known as A. Daylighting.
What is daylighting?This is the illumination of buildings with natural light through the practice of placing reflective surfaces so that sunlight can provide effective internal lighting.
Solar heating is the use of sunlight to heat water or air in the buildings using radiant light and heat which is harnessed using a range of technology such as solar power to generate electricity.
Hence, we can see that neither weatherizing, green roofing nor cool roofing is the answer because they do not deal with providing passive solar heating, but daylighting uses passive solar heating.
Therefore, the correct answer is option A.
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Diabetes, a recessive trait, occurs in 10% of a certain population. What is the proper letter used as a symbol for the gene concerned? If a
normal female and a normal male in this population have a child who is diabetic, what is the probability that their next child will be a
diabetic?
Answers
Diabetes can be properly designed by using the letter symbol for the gene concerned as a lowercase letter (d) because it is a recessive trait.
What is a recessive trait?A recessive trait is any phenotypic feature that is expressed when two recessive alleles are found in an individual and show complete dominance by means of dominant alleles that masks recessive expression.
For example, if a normal female and a normal male in the population have a child who is diabetic, then the probability that their next child will be 25% (parents are heterozygous for the trait).
In conclusion, Diabetes can be properly designed by using the letter symbol for the gene concerned as a lowercase letter (d) because it is a recessive trait.
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identify the phase in the life cycle lf small and big stars
Answers
Answer:
small: giant, white dwarf, neutron star
big: supernova, planetary nebula
Explanation:
Answer:
Explanation:
got it right
If a runner is doing vigorous exercise, which results from the anaerobic cellular process?
accumulation of lactic acid
accumulation of oxygen
depletion of ethanol
depletion of carbon dioxide
Answers
Answer:
Accumulation of lactic acid
The anaerobic cellular process is a type of respiration that occurs in the scarcity of oxygen. Lactic acid gets accumulated in anaerobic respiration during vigorous exercise. Thus, option A is correct.
What is anaerobic respiration?Anaerobic respiration is a cellular process where the organic and the biological fuel are broken and oxidized through the electron transport chain in the cytoplasm of the cell.
The anaerobic cellular process lacks the use of oxygen so to produce energy like ATP and lactic acid accumulation due to the high energy demand during vigorous exercise.
In the anaerobic cellular process, carbon dioxide and water are formed as a byproduct along with lactic acid and ATP. Lactic acid is formed from the breakdown of glucose and glycogen.
Therefore, in option A. in the anaerobic cellular process, accumulation of lactic acid occurs.
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You collect individuals from different allopatric populations of a leaf-eating beetle. In the laboratory, you conduct mate-choice experiments to assess levels of reproductive isolation among beetles from different populations. Assuming that ecological speciation occurred in the wild, which pattern should you expect?.
Answers
Less reproductive isolation among populations that share similar habitats.
What is ecological speciation?The process through which new species arise as a result of divergent natural selection between dissimilar ecological habitats is known as ecological speciation. Ecological speciation happens when reproductive isolation evolves as a result of adaptation to various habitats or resources.
The brief history of a gene flow barrier in the population that leads to environmentally based divergent selection in the development is known as ecological speciation. The Charles Darwin theory of evolution is connected to this one. It offers the world's population diversity. The species frequently occurs through natural selection. Additionally, the speciation happens in two ways:
Ecological speciationNatural selectionThe genetic diversity in the population does contribute to ecological speciation.
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Which of the following is the most permeable?
gravel
nonporous rock
clay
shale
Answers
Answer:
I think the correct answer of this question is first option. Gravel is the most permeable
A mixture of 2 substances can be separated by BOTH the methods given below.
Method 1 - by sieving the mixture through a mesh
Method 2 - by adding water to the mixture and then filtering it through a filter paper.
What can the mixture be?
Answers
Answer:
one solid insoluble substance
one solid insoluble substance other different size.
The image below shows the process of DNA replication. Identify the components of the process
Answers
Answer:
See below.
Explanation:
The biological process of creating two identical copies of DNA from a single original DNA molecule is known as DNA replication.
A double helix of two complementary strands makes up DNA. These strands are split apart in the replication process. The method of semi-conservative replication uses each strand of the original DNA molecule as a template to create its counterpart.
This process is carried out by several enzymes which are listed below along with their activity
__
DNA Dependent DNA POLYMERASE is a class of enzymes that is responsible for all organisms' DNA replication processes. It accelerates DNA replication in the 5′ to 3′ range.The enzyme known as TOPOISOMERASE is involved in the over- or under-winding of DNA.HELICASE—Using the energy from ATP hydrolysis, which is characterized by the breakdown of hydrogen bonds between annealed nucleotide bases, helicases are frequently employed to separate the strands of a DNA double helix or a self-annealed RNA molecule.DNA GYRASE, a particular kind of topoisomerase, relieves strain caused by DNA helicase's unwinding action.DNA LIGASE- Joins the OKAZAKI FRAGMENT of the lagging strand and re-anneals the semi-conservative strands.PRIMASE - Primase catalyzes the production of a short primer, which is a ssDNA template-specific piece of RNA (or DNA in other species).REPLICATION FORK -
INITIATION: The beginning of DNA replication takes place at certain locations in DNA known as ori-sites or regions. Enzymes often recognize these locations and initiate the process. As opposed to C-G base pairs, which produce three hydrogen bonds, A-T base pairs only form two hydrogen bonds, making them easier to strand split. As a result, these sites are typically "AT-rich" (rich in adenine and thymine bases). Following the discovery of the origin, enzymes create a pre-replication complex that unzips the double-stranded DNA. The enzyme topoisomerase is involved in this process. ELONGATION: The 5'-3' activity of the DNA polymerase enzyme. Now, a new strand was created by DNA polymerase enzymes in the direction of 5′ to 3′ (note: the DNA template is read in 3' to 5' direction). RNA primers were simultaneously created by the primase enzyme and utilised by the polymerase to create new strands of RNA.Due to the 5′ - 3′ orientation of the DNA polymerase enzyme, two types of strands are formed.
LEADING STRAND - A DNA polymerase with high processivity that has the direction 5′ - 3′ (template strand 3′-5′) extends the continuous strand from the primer in the same direction as the replication fork that is expanding. One RNA primer is applied to the leading strand. LAGGING STRAND - It is the discontinuous strand whose synthesis is going in the opposite direction of the replication fork that is developing. Each primer extends the lagging strand intermittently to create Okazaki fragments. A low processivity DNA polymerase that is different from the replicative polymerase enters to fill the gaps after RNase eliminates the priming RNA pieces. Multiple primers are applied to the lagging strand, and then the Okazaki fragments are joined by the ligase enzyme, filling in the gaps.TERMINATION - Replication forks meet and end at several locations throughout the chromosome because eukaryotes start DNA replication at various locations; it is unknown how these are controlled. Termination necessitates the halting or blocking of the DNA replication fork's forward motion. When termination occurs at a particular locus, it includes the interaction of two elements: (1) a DNA sequence known as a termination site sequence, and (2) a protein that binds to this region to actually cease DNA replication.- Thank you.