Question

Q1) which hormone is Not synthesized in the hypothalamus?

1. Oxytocin (OT)
2. Thyrotropin-releasing hormone (THR)
3. Somatostatin
4. Prolactin (PRL)
5. Antidiuretic hormone (ADH)

Q2) Which of the following statement is false.

1. Taste signals travel from the tongue through the facial and hypoglossal nerve.
2. The middle ear consists of an air-filled chamber.
3. Rods secrete glutamate from the base of the cell when not exposed to light.
4. Peptide hormones are synthesized by the rough endoplasmic reticulum.
5. None of these.

Q3) Epidural anesthesia is introduce in the epidural space between _______to block pain signals during pregnancy

1. Dural sheath and vertebral bones
2. Dura mater and pia mater
3. Dural sheath ad dura mater
4. Arachnoid mater and pia mater
5. Dura mater and arachnoid mater

Q4) Which of the following causes the plasma membrane to depolarize from its resting membrane potential (RMP)?

1. Outflow of sodium ions
2. Inflow of chloride ions
3. Outflow of glucose
4. Inflow of potassium ions
5. None of these

Q5) Which statement is false?
  a. Axons arising in the cerebellum cannot excite skeletal muscle contraction.
b. If a muscle is repeatedly stimulated and allowed to relax between stimuli, the successive contractions will be stronger. This phenomenon, known as treppe, or staircase effect, is thought to be due to the accumulation of calcium ions in the sarcoplasm.
c. Large motor units having a large innervation ratio allow for less control than small motor units.
d. A muscle contract more strongly when lifting a 20-pound weight than when lifting a 5-pound weight. This is because individual fibers contract harder.
e. None of these.

Answer 1

1. It's prolactin.

Prolactin is synthesized and released in the anterior pituitary. All other hormones are synthesized by the hypothalamus.

2. Taste signals travel from the tongue through the facial and hypoglossal nerve.

It's false because the hypoglossal nerve doesn't carry the taste siganal. It's the glossopharyngeal nerve that carry the taste signal.

3. It's the dural sheath and vertebral bones.

Dural sheath is made up of dura matter and the epidural space is made between dura matter and vertebral bones

4. None of these.

It's due to the influx of sodium ions. The sodium influx makes the membrane potential more positive and thus leads to the depolarization.

5. If a muscle is repeatedly stimulated and allowed to relax between stimuli, the successive contractions will be stronger. This phenomenon, known as treppe, or staircase effect, is thought to be due to the accumulation of calcium ions in the sarcoplasm.

It's false because this happens to a muscle after a period of rest. A muscle after rest is given more contraction stimuli to contract harder and no rest is given in between