The sensory nerve fibers (Column X) and the sensory receptors connected to different sensory nerves (Column Y) are given below. Column X Column Y Sensory nerve fibre Sensory receptor A. la i. Muscle spindle, flower spray ending B. Ib ii. Pain and cold receptor C. II iii. Muscle spindle, annulo-spiral ending D. III iv. Golgi tendon organ Which of the following options represents the correct match between column X and column Y?
A - iii, B - iv, C - i, D - ii
This question asks us to match different types of sensory nerve fibers with the specific sensory receptors they are connected to. Sensory nerve fibers carry information from sensory receptors in the body back to the central nervous system (brain and spinal cord).
Sensory Nerve Fiber Matching
Sensory nerve fibers are classified based on their diameter and myelination, which affects how quickly they conduct nerve impulses. The classification systems often use Roman numerals (I, II, III, IV) or letters (Aβ, Aδ, C). In the system used here (Roman numerals), Type I fibers are the largest and fastest, while Type IV fibers are the smallest and slowest.
Let's look at the common types mentioned and their associated receptors:
- Type Ia fibers: These are large, myelinated fibers that innervate the annulospiral endings of muscle spindles. Muscle spindles detect changes in muscle length and the rate of change of length. Annulospiral endings are the primary sensory endings within muscle spindles.
- Type Ib fibers: These are also large, myelinated fibers. They are associated with Golgi tendon organs. Golgi tendon organs are located in tendons and detect muscle tension.
- Type II fibers: These are medium-sized, myelinated fibers. They primarily innervate the flower-spray endings (also called secondary endings) of muscle spindles. Flower-spray endings also detect muscle length, but their response is less dynamic than annulospiral endings. Type II fibers also carry touch and pressure information from other receptors.
- Type III fibers: These are small, thinly myelinated fibers. They transmit information about crude touch, pressure, pain, and temperature (specifically cold). Receptors include free nerve endings for pain and temperature.
Based on this information, let's match the columns provided in the question:
| Column X (Sensory nerve fibre) | Column Y (Sensory receptor) | Matching |
|---|---|---|
| A. Ia | i. Muscle spindle, flower spray ending | Ia matches Annulo-spiral ending |
| B. Ib | ii. Pain and cold receptor | Ib matches Golgi tendon organ |
| C. II | iii. Muscle spindle, annulo-spiral ending | II matches Flower spray ending |
| D. III | iv. Golgi tendon organ | III matches Pain and cold receptor |
Now, let's create the correct pairings based on the typical connections:
- Ia fibers connect to Muscle spindle, annulo-spiral ending (Y-iii). So, A - iii.
- Ib fibers connect to Golgi tendon organ (Y-iv). So, B - iv.
- II fibers connect to Muscle spindle, flower spray ending (Y-i). So, C - i.
- III fibers connect to Pain and cold receptor (Y-ii). So, D - ii.
Therefore, the correct match is A - iii, B - iv, C - i, D - ii.
Important Questions from System Physiology Animal
Which one of the following synaptic vesicles (as observed under transmission electron microscope) contains catecholamines?
Blood hemostasis is the interplay of several intrinsic and extrinsic factors. Deficiency of some of the blood clotting factors and their clinical manifestations are listed below.
Factors
Manifestations
A.
V
i.
Hageman trait
B.
VII
ii.
Hypoconvertemia
C.
IX
iii.
Hemophilia B
D.
XII
iv.
Parahemophilia
Which one of the following options represents all correct matches?
Aldosterone is synthesized exclusively in zona glomerulosa due to the presence of _________ enzyme in addition to a dehydrogenase.
How much hemoglobin is present approximately in each normal human red blood cell?
Given below are statements about the Kallmann syndrome.
A. It is a condition of hypogonadotropic hypogonadism.
B. There is a loss of sense of smell in such individuals.
C. This syndrome is most common in women.
D. It happens due to mutation of the KALIG1 gene on X-chromosome that codes for an adhesion molecule necessary for the normal development of the gustatory nerve.
Which one of the following options has the combination of all correct statements?
