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
Nookie1986 [14]
3 years ago
8

Explain what happens to the bands A,I,H when aconraction occurs in the muscles.

Biology
1 answer:
worty [1.4K]3 years ago
4 0

Answer:

The functional unit of a muscle cell is known as a "sarcomere" which covers the distance between the two Z-lines.

The sarcomere consists of A-zone which contains both thick and thin filaments, H-zone which contains only thick filaments and I band which contains only thin filaments.

During muscle contraction, thick and thin myofibrils slide over each other due to which the distance between two z-line get reduced. The H and I zone gets shortened but A zone does not shorten but come close to other A- bands and disappears.

You might be interested in
Which statements describe analogous structures? Select three options. Analogous structures indicate a common ancestor. Analogous
Vinil7 [7]

Answer:

The correct answers are:

Analogous structures do not indicate a common ancestor. Analogous structures have the same function but a different structure. An example of an analogous structure is the wing of a bat and a butterfly.

Explanation:

Analogous structures are the structures that have a similar function in various organisms but their anatomic structure is different from one another in reality. Analogous structures are do not indicate a common ancestor.

An analogous structures example is the wings of the bat and butterfly as they are both used for flying but their structure is different anatomically from one another.

6 0
2 years ago
Read 2 more answers
The process of change in a population over the thime is called?
qwelly [4]

Answer:

tramwayniceixand 1 otherlearned from this answer. Answer: 1. Micro-evolution is the change in allele frequencies that occurs over time within a population. This change is due to four different processes: mutation, selection (natural and artificial), gene flow and genetic drift. 2.

Explanation:

This change is due to four different processes: mutation, selection (natural and artificial), gene flow and genetic drift. 2.

5 0
2 years ago
Hummingbirds need large amounts of energy to flap their wings between 60 and 200 times per second. Their wings beat so rapidly t
Rzqust [24]
I think the answer would be G
5 0
2 years ago
Pls help fizzly me confused and ill give you a briliant thingy
Alex73 [517]

Answer:

One difference between these cells is plant cell has chloroplast but animal cell does not have chloroplast.

Another difference between these is that plant cell has cell wall but animal cell does not have cell wall.

Explanation:

Plant cell are known to cells that possess chloroplast. These chloroplast contain chlorophyll which enables the plants to manufacture their own food. Animal cell does not possess chloroplast which makes it impossible for animals to manufacture their own food.

Plant cell actually have cell wall and a cell membrane but animal cell does not have cell wall but only possesses cell membrane. The cell wall gives mechanical strength and maintains cell shape.

7 0
2 years ago
How is observation used by science
OlgaM077 [116]

Answer:

in science Observation is essential in science. Scientists use observation to

collect and record data, which enables them to construct and

then test hypotheses and theories . Scientists observe in many

ways – with their own senses or with tools such as microscopes,

scanners or transmitters to extend their vision or hearing

6 0
2 years ago
Other questions:
  • How does the fossil record allow us to determine a common<br> ancestor?
    7·1 answer
  • Does Eukaryotes, fungi,both, or none. Have a membrane-bound nucleus ?
    12·1 answer
  • An ecologist studied the same species of deer during the summer and the winter. She noticed that during the summer, when there w
    8·2 answers
  • Dynamic stretches are part of an effective warm-up because they can help...
    13·2 answers
  • Someone help me asap lol thanks
    12·1 answer
  • Oriana touches a positively charged metal plate to a neutral metal sphere. How does the charge of the metal
    5·1 answer
  • 19. Which of the following is the best strategy to control wheat rust?
    11·1 answer
  • A DESCOBERTA DA CÉLULA
    10·1 answer
  • Tamika inflates and ties off a balloon in her classroom and then takes it outside on a cold, winter day. Immediately, she notice
    10·1 answer
  • What is the specific function of a heterocyst cell of an Anabanea filament?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!