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Rina8888 [55]
3 years ago
6

Arrange the steps in the correct order to explain how a muscle fiber contracts. Myosin and actin protein filaments attach to eac

h other. Calcium ions release into the myofibrils. Myosin filaments pull on the actin filaments. The nerve impulse reaches the neuromuscular junction. The motor neuron carries the nerve impulse. The sarcomere shortens. ↓ ↓ ↓ ↓ ↓
Biology
2 answers:
Pavel [41]3 years ago
8 0

Answer:

The motor neuron carries the nerve impulse.

↓

The nerve impulse reaches the neuromuscular junction.

↓

Calcium ions release into the myofibrils.

↓

Myosin and actin protein filaments attach to each other.

↓

Myosin filaments pull on the actin filaments.

↓

The sarcomere shortens.

Explanation:

Just took the test!

nasty-shy [4]3 years ago
4 0

The motor neuron carries the nerve impulse.

↓

The nerve impulse reaches the neuromuscular junction.

↓

Calcium ions release into the myofibrils.

↓

Myosin and actin protein filaments attach to each other.

↓

Myosin filaments pull on the actin filaments.

↓

The sarcomere shortens.

The neurotransmitter (ACh) from motor neurons signals a muscle fiber to depolarize. The depolarization (Na+) will trigger Ca++ release and will initiate contraction by binding to troponin. Myosin pulls the actin strands. ATP sustains the contraction.

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4 0
2 years ago
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Primary growth or lengthening of plants results from mitotic division in cells of which tissue? A.Axillary buds B.Lateral merist
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7 0
3 years ago
In a plant, leaf color and leaf shape are controlled by two linked genes Leaves of the wild-type plant are red. A recessive muta
Brrunno [24]

Solution :

Red is dominant over the white leaves and pointed is dominant over smooth.

Red = R ,    white = r

Pointed = P ,   smooth = p

Red, pointed x white,smooth ------ Parents

RRPP                 rrpp

RP                      rp  ----------------- Gametes

         RrPp    -------- $F_1$

  (red, pointed)

When this $F_1$ is test crossed,

RrPp  x  rrpp     ----  $F_1$ test cross

Gametes   → rp

RP ---------- RrPp - red, pointed - 36 parental type

Rp ---------- Rprp - red, smooth - 14 re- combination

rP ----------- rrPp - white pointed - 10 re- combination

rp ----------- rrpp - white, smooth - 40 - parental type

                                    Total =   100

As this ratio is deviating from 1:1:1:1, it indicated the two genes are linked.

Linkage strength = percentage of crossing over = map distance between the genes.

Percentage crossing = recombination frequency = percentage of recombination.

Recombination frequency $=\frac{\text{total no. of recombination}}{\text{total no. of progeny}}\times 100$

                                         $=\frac{14+10}{100} \times 100$

                                         = 24 %

                                        = 24 map units

4 0
3 years ago
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