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2 years ago

Hey guys! im stuck on this hard question please save me lol

Biology

2 answers:

spayn [35]2 years ago

8 0

Answer:

1.chemical receptors

2. nerves carry signal to the brain

3. nerves carry signals to the muscle

4. the brain process these signals

5. the shark changes direction and swims towards pray

Explanation:

Klio2033 [76]2 years ago

6 0

Answer:

1)chemical receptors in the nose sense odor particles in the water

2) nerves carry signals to the brain

3) the sharks brain processes the signals

4) nerves carry signals to the muscle

5)the shark changes direction to swim towards the prey

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"A total artificial heart (TAH) is an electrically powered pump that circulates blood into the pulmonary artery and the aorta, t

yawa3891 [41]

a) It never needs batteries.

b) It's designed for extremely active patients.

c) It's specifically designed for long-term use.

d) An LVAD only supports a failing left ventricle.

Answer:

d) An LVAD only supports a failing left ventricle.

Explanation:

When both halves (R.&L Ventricles) of the heart failed to pump blood, together with the failure of the valves to regulate blood flow as in biventricular failure, a device can planted in the patient to replace the failed right or let ventricles and to control the directional flow of blood to the vascular system. This device is called TAH.

However when the left ventricle is faulty so that blood pump into the systemic circulation is affected in case of a patient who is waiting for heart transplants not old enough for transplants; who needs to sustain heart function after surgery; or patients who could not find a heart donor and therefore need to survive, a mechanical pump is implanted below the diaphragm and power by battery cell in a wearable outside. This miniature mechanical pump is called Left venticular assist device(LVAD).It only correct left ventricle anomaly .

Thus the major difference between the two is that LVAD, is only for the faulty left Ventricle correction.

7 0

2 years ago

Sort the phrases into the appropriate bins depending on whether they are true only for channels, true only for carrier proteins,

ehidna [41]

<h2>The correct answer is explained below:</h2>

Explanation:

The Plasma membrane of a cell is made up of a phospholipid bilayer which has a hydrophobic core and hence is impermeable to water soluble or polar organic and inorganic molecules.
However, a cell can maintain proper homeostsis and undergo metabolism only when it is able to exchange different hydrophilic and polar organic and inorganic chemical components present inside the cell with those present outside the cell.
This necessitates the development of a "path" that could connect the cell interior to the cell exterior.
The path is developed by integral membrane protein that spans across the lipid bilayer opening on either side of the membrane, thereby connecting the cell interior with the cell exterior.
These integral membrane proteins are amphipathic in nature, that is, they are composed of both polar and non-polar amino acid residues. The amino acid residues are arranged such that the non polar amino acid residues face and undergo hydrophobic interactions with the water avoiding lipid molecules in the plasma membrane. The polar amino acid residues face towards the lumen of the opening in between the cell interior and exterior such that they can form hydrogen bonding with the water soluble polar organic or inorganic molecules and help them traverse the plasma membrane.
These integral membrane proteins are of two types: Channel proteins and Carrier proteins.
The Channel proteins:

Form a direct and continuous opening across the plasma membrane. They can either remain always open or can be gated, that is, they open only on associating with specific signalling molecules.
They transport solutes from a region of high electrical charge or concentration to a region of low electrical charge or concentration, that is, down the electrochemical or concentration gradient.
They usually allow the easy and quick transport of water molecules and small ions across the membrane.

The Carrier proteins:

They undergo a change in their conformation to translocate solute molecules across the plasma membrane and they do not form a continuous opening.
When they open on one side of the membrane they are closed on the other side. They cannot remain, simultaneously, open on both sides of the membrane.
They are required mainly for the translocation of small polar organic molecules across the plasma membrane down the electrochemical or concentration gradient.

For channels only:

For carrier proteins only:

For channels as well as carrier proteins both:

4 0

3 years ago

Cells transport molecules into the cell in many different ways. One method is through endocytosis, shown in the model. In endocy

Fudgin [204]

Answer:

This is because fluids have a polar nature, so they couldn´t cross the lipidic bilayer that constitutes the plasma membrane

Explanation:

Plasma membranes are contituted by lipid bilayers. These kind of compounds are hidrophobic (they reject water) and don´t permit the freely passage of hidriphilic molecules that can disolve in water, constituing fluids. Because of that cells developed transport mechanism like endocytosis.

4 0

3 years ago

Read 2 more answers

In order to see an absorbance peak in an ir spectrum, the molecule must ___________.

Arte-miy333 [17]

The answer is b. have a change in dipole moment

When a molecule absorbs an infrared ray, its energy will increase. The energy will increase the rotational movement or the molecule. If the energy increases further, it will become the vibrational movement. Dipole moment will be increased if the vibrational movement is increased.

4 0

3 years ago

12. If an ecologist is looking at how many individual organisms live within a certain population, he or she is studying the popu

sukhopar [10]

The answer would be C or Population Density

7 0

2 years ago

Read 2 more answers