1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
mamaluj [8]
4 years ago
8

The muscle cells of people with muscular dystrophy lack a protein, called dystrophin, that helps maintain the sarcoplasmic retic

ulum of muscle cells. as a result, the sarcoplasmic reticulum allows calcium ions to leak out. why would this condition affect muscle function?
Biology
1 answer:
bonufazy [111]4 years ago
6 0

Answer: It will affect muscle contraction because it is needed for the formation of muscle contraction cross-bridge.

Explanation: During muscle contraction calcium binds to troponin, a protein complex that regulates muscle contraction by exposing the binding site of actin filament. Actin filament active site is where myosin head binds to, creating a cross-bridge using enzyme ATPase to speed the reaction. Calcium ion are needed to activate troponin movement, otherwise it stays in its inactive form blocking the active site of actin filament. Without calcium ions, troponin will not move and there will be no muscle contractions.

You might be interested in
Consider the following hypothetical population and compute the statistical measures below: #births = 50,000; #deaths = 10,000; #
777dan777 [17]

Answer:

The birth rate refers to an average number of births in one year per thousand individuals in the population at mid-year.  

BR = (total birth in an annum / total population in mid year) * 1000

BR = (50000 / 1000000) * 1000 = 50

Death rate refers to an average number of death in an annum per thousand individuals in a population at mid year. Thus,  

DR = (total death / total population in mid year) * 1000

DR = (10000 / 1000000) * 1000 = 10

Annual population growth rate or APGR is calculated as:  

APGR = (Birth rate - Death rate) / Death rate

APGR = (50 - 10) / 10 = 4.0 %

Doubling time is the whole sum time needed for a population to get double in size. It is calculated as DT = ln (2) / growth rate

70 / 4.0 = 17.5 years

Thus, population will get double in 17.5 years.  

Adjusted (true) growth rate is equal to APGR + (NMR / Death rate)

And NMR = [(immigrants -emigrants) / total population] * 1000

NMR = [(5000 - 20000) / 1000000] * 1000 = -15

Thus, Adjusted (True) growth rate = 4.0 + (-15 /10) = -6%

The adjusted (true) doubling time = ln (2) / Adjusted growth rate  

= 70 / -6 = -11.66

This negative sign shows that it will never get double in such situation.  

5 0
3 years ago
What is one difference between dna replication in bacteria versus eukaryotes?
Drupady [299]

Answer:

Bacterial DNA replication moves out from the origin of replication in two directions, while eukaryotic DNA replication moves out from the origin of replication in only one direction.

Explanation:

7 0
3 years ago
Which process drives Darwin's theory of evolution?
Crank
It’s natural selection
3 0
3 years ago
Read 2 more answers
A student used the hemoglobin data to conclude that mice and shrews are more closely related than are mice and humans or shrews
Lilit [14]
<span>The student who use the hemoglobin data to conclude that mice and shrews are more closely related than mice and humans or shrew and human is quite correct. Scientists had found a way of determining the evolution histroy of animals by means of the amino acid sequence of their hemoglobin. The higher the number of related amino acids found the closer the relationship between the two organisms. There are a difference of 29 amino acid between man and mouse and a difference of 24 amino acids between human and shrew but only a difference of 5 amino acid between mouse and shrew. This shows that mouse and shrew are closer.</span>
4 0
3 years ago
What macromolecule will your body break down first in order to get atp
vovikov84 [41]

Answer: Glucose

Explanation:

4 0
3 years ago
Other questions:
  • Does the kingdom fungi consist both unicellular and multicellular organisms
    15·1 answer
  • A camel has a hump to store water so it can survive in its desert environment. which kind of adaptation is this?
    5·2 answers
  • Select all of the following that are characteristics of heat.
    10·1 answer
  • Where does DNA replication take place? * O G1 Phase S Phase G2 Phase Mitosis​
    12·1 answer
  • What is true of the bottom layer of the ocean? Choose the two correct answers. A. It has the coldest water B.it has the lowest s
    8·1 answer
  • What is the relationship between the oxygen cycle and the carbon cycle?
    8·2 answers
  • A type of reproduction that can be done with one parent
    15·1 answer
  • Any time there is waste to break down, decomposers break it down into smaller parts like __________________ and ________________
    11·1 answer
  • How can G and cloning be used in medical science
    7·1 answer
  • Can someone give me a 10th or 11th grade science fair topic?? i have no clue what to do!!!!​
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!