When the membrane of a neuron is at rest all of the following are true except: a

Question

When the membrane of a neuron is at rest all of the following are true except: a. The voltage across the cell membrane is negative and stable b. The membrane is significantly more permeable to potassium than to sodium c. The sodium-potassium pump moves 3 sodium ions out of the cell for every 2 potassium ions it moves in d. Sodium and Potassium are moving through voltage gated channels Which of the following is not a factor that affects perception? a. Our experience, emotions and memories b. Processing occurs prior to signals reaching conscious awareness c. Receptors are limited in terms of the form of energy they detect d. None: that is, all of the above affect perception When you're sitting at home having a snack and watching your favorite TV show, which branch of the autonomic nervous system dominates: _____, and during this time the input of this branch into the tissues of the digestive tract would be describes as _____. a. Parasympathetic//excitatory b. Sympathetic//excitatory c. Parasympathetic//Inhibitory d. Sympathetic//Inhibitory What is a feature of thyroid hormone (TH)? a. TH is involved in neutral development b. TH seems to be needed for normal metabolism c. T4 is the major form of TH, but T3 is the active form of TH d. TH is hydrophobic e. ALL of the above is true Pick the TRUE statement about cortisol a. The adrenal medulla secretes this hormone b. ACTH induces its release c. It stimulates hepatic glucose release, which raises the level of glucose in the blood d. TWO of the above are CORRECT e. ALL of the above are CORRECT If a bunch of phospholipids were dumped into a water medium, they would spontaneously rearrange themselves as follow. All are true except: a. They line up in two rows such that the heads face out and tails face in b. The space at the center of the arranged phospholipids is hydrophobic and the edges are hydrophobic c. The heads are charged and the tails are uncharged d. None, as all of the above are actually true statements

Explanation / Answer

Ans-5 (d)- Sodium and potassium ions are movinf from through voltage gated ions channels.

These channels are typically activated by membrane depolarization or hyperpolarization

A resting (non-signaling) neuron has a voltage across its membrane called the resting membrane potential, or simply the resting potential. The values for resting membrane porentials is app. –70mV that means the interior of a cell has a negative baseline voltage.

the membrane permeability for potassium is much higher than that for other ions, potassium ions flow from the cytosol into the extracellular space carrying out positive charge.

In the case of the resting membrane potential across an animal cell's plasma membrane, potassium (and sodium) gradients are established by the Na+/K+-ATPase (sodium-potassium pump) which transports 2 potassium ions inside and 3 sodium ions outside at the cost of 1 ATP molecule.

Ans-6 (d)

Ans-7 (a)

Parasympathatic// excitatory or stimulatory

Ans-8

Thyroid hormone;

Both T4 (thyroxine) and T3 (triiodothyronine) are secreted by thyroid gland. T4is converted to T3 in target tissues. Thyroid hormones act on nearly every cell in the body. They act to increase the basal metabolic rate i.e. they are needed for i.e. they are needed for normal metabolism. These are hydrophobic in nature because of large aromatic rings on the tyrosines used in their production. Tyrosine is a hydrophobic amino acid.

So the answer is ALL OF THE ABOVE IS TRUE

Ans-9

It is produced in humans by the zona fasciculata of the adrenal cortex. ACTH stimulates secretion of glucocorticoid steroid hormones from adrenal cortex cells i.e cortisol. It increase blood sugar through gluconeogenesis.

So the statement ‘b’ and ‘c’ is correct. Answer is (d)

Ans-10

Answer- (a)- They will arrange micelle or line up in two rows so that head face outwarp (hydrophillic) and tail towards inside (hydrophobic)

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