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zzz [600]
3 years ago
12

The fourth week after conception, growth is rapid. The neutral tube along a baby’s back is closing and the baby’s heart is pumpi

ng blood. If this neutral tube does not close properly, a condition called ______ may results.
Biology
1 answer:
Marysya12 [62]3 years ago
7 0
Could it be Spina Bifida?
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What must happen for the lungs to expand allowing you to inhale
malfutka [58]
Ur intercostle muscle between ur ribs
3 0
3 years ago
Rank the sequence of events at the NMJ that initiate an action potential in the muscle fiber, from first to last.
wlad13 [49]

The correct order is:

- Action potential arrives at the axon terminal.

- Calcium ions enter the axon terminal.

- Synaptic vesicles fuse to membrane of axon terminal.

- Acetylcholine is released into the synaptic cleft.

- Acetylcholine binds to its receptors on the junctional folds.

- Junctional folds become depolarized.

- Action potential is initiated on the sarcolemma.

Action potential travels through the membrane of the presynaptic cell causing the channels permeable to calcium ions to open. Ca2+ flow through the presynaptic membrane and increase the Ca concentration in the cell which will activate proteins attached to vesicles that contain a neurotransmitter (e.g. acetylcholine). Vesicles fuse with the membrane of the presynaptic cell, thereby release their contents into the synaptic cleft-space between the membranes of the pre- and postsynaptic cells. Neurotransmitter binds to its receptors on the postsynaptic membrane and its binding causes depolarization of the target cell (muscle cell).

4 0
3 years ago
Triangle ABC is an equilateral triangle with side lengths labeled a, b, and c. Triangle A B C is an equilateral triangle. The le
kirill115 [55]

Answer:

One-half b c sine (60 degrees)

One-half a squared sine (60 degrees)

StartFraction a b sine (60 degrees) Over 2 EndFraction

Explanation:

The area rule states that the area of any triangle is equal to half the product of the lengths of the two sides of the triangle multiplied by the sine of the angle included by the two sides.

From the question, Equilateral triangle refer to a triangle with equal angle and equal sides. The sum of an angle in a triangle = 180°; this implies that each angles have 60°.

∴ the three options that defines the expressions that represent the are of triangle ABC are:

One-half b c sine (60 degrees)  

i.e \frac{1}{2}bcsin60^{0}

One-half a squared sine (60 degrees) ; if the two opposite sides posses the same parameters.

i.e \frac{1}{2}a^{2}sin60^{0}

StartFraction a b sine (60 degrees) Over 2 EndFraction

i.e \frac{absin60^{0}}{2}

8 0
3 years ago
Read 2 more answers
In the phospholipid, the polar head is considered what type of structure? 1.hydrophobic 2.insoluble 3.hydrophilic​
Mumz [18]
Your answer is hydrophilic, The phosphate group is the negatively-charged polar head, which is hydrophilic. The fatty acid chains are the uncharged, nonpolar tails, which are hydrophobic.

Hope this helps!
7 0
3 years ago
Monomers linked together to form a polymer could be described as beads and a multicolored necklace which one of the following st
s2008m [1.1K]
Multicolor necklace indicates that Monomers in a polymer are of different types
6 0
3 years ago
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