Tissues Test

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Tissues Test - 76

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Weekly Quiz Competition

Question 1
1 / -0

The approximate number of leucocytes present in one $$mm^3$$ of blood is:

A
5000-8000

B
2000-3000

C
8000-13000

D
1 million to 1.5 million

Solution

Leucocytes or white blood cells (WBCs) are colorless, nucleated, and motile cells of the blood. Their normal count is 5000- 8000 cells per $$mm^3$$ of blood. WBCs (White blood cells) can be granulocytes or agranulocytes, depending upon whether they have granules or not.
So, the correct answer is option A.
Question 2
1 / -0

The cells of which layer contain droplets of eleidin.

A
Stratum lucidum

B
Stratum granulosum

C
Stratum corneum

D
Stratum spinosum

Solution

In Stratum lucidum, the layer is thicker on the palms and soles. The layer consists of several rows of clear, flat and dead cells. It contains the droplets of a clear substance called eleidin.
In Stratum granulosum, three to five rows of flattened cells are found, containing keratohyalin as a substance. In Stratum corneum, twenty-five to thirty rows of flat, dead cells which are completely filled with keratin
In Stratum spinosum, eight to ten rows of the polyhedral cells that fit closely together make up this layer of the epidermis.

So the correct answer is option A.
Question 3
1 / -0

A fully mature human RBC has:

A
A nucleus

B
No nucleus

C
Mitochondria

D
Golgi bodies

Solution

Mature human RBCs are roughly circular and non-nucleated. Absence of nucleus imparts RBCs a biconcave disc-like shape. The concave surface of RBC increases the surface area of the cell and facilitates the diffusion of oxygen and carbon dioxide in and out of the cell. They also lose most of the cell organelles like mitochondria, Golgi bodies, ribosomes, etc. during maturation to become efficient oxygen carriers.
So, the correct answer is option B.
Question 4
1 / -0

Heart muscle is sensitive to:

A
Electrical stimuli

B
Chemical stimuli

C
Mechanical stimuli

D
All the above

Solution

Heart muscle or cardiac muscle is one of the three major types of muscles present in vertebrates. It is an involuntary, striated muscle. The heart muscle is sensitive to electrical, chemical (drugs) and mechanical stimuli.
So, the correct answer is option D- 'All of the above'.
Question 5
1 / -0

Which is correct about leucocytes?

A
They are red coloured.

B
They can cross capillaries.

C
They are enucleate.

D
Decrease in their number causes leukemia.

Solution

A. Leucocytes are white blood cells (WBCs).
B. They are capable of amoeboid movement due to which they can cross or squeeze out of the capillaries into tissues and this process is known as diapedesis.
C. They are nucleated i.e., they have a nucleus.
D. Increase in their number cause leukemia which is cancer of WBCs.
Hence, only statement B is correct.
So, the correct answer is 'They can cross capillaries'.
Question 6
1 / -0

The contractile regulatory proteins that mask and unmask active sites in the sarcomere are:

A
Troponin and tropomyosin

B
Troponin and myosin

C
Actin and myosin

D
Troponin 1 and troponin C
Solution
- The contractile regulatory proteins that mask and unmask active sites in the sarcomere are troponin and tropomyosin.
- The two tropomyosin filaments run close to the actin filaments throughout its length.
- The troponin units are distributed throughout the length of tropomyosin filaments and mask the active binding sites for myosin.
- During muscle contraction, the increased calcium ion levels lead to their binding to a subunit of troponin and unmasking the active sites for myosin filaments.
So, the correct answer is option A.
Question 7
1 / -0

At full muscle contraction, the Z-lines attached to thin filaments are almost touching

A
A-band

B
I-band

C
Actin fibres

D
H-zone

Solution

As shown in the diagram, as the myofibril contracts, the actin filaments are pulled by myosin filaments to the center, which is explained by the sliding filament theory.
So, when the muscle is fully contracted, the I band almost disappears and Z line comes to lie close, touching the A band.
So, the correct option is 'A-band'.
Question 8
1 / -0

The type of muscle present in the alimentary canal is:

A
Smooth muscle

B
Skeletal muscle

C
Cardiac muscle

D
Both A and B

Solution

Skeletal muscles: attached to bones and help in movement (voluntary movements)
Smooth or Involuntary muscles are found in those parts that help in involuntary movements like - alimentary canal (to push food),
Cardiac muscles are found in the heart.
So, the correct option is 'Smooth muscle'
Question 9
1 / -0

Which among the following is correctly categorized?

A
Troponin and Myosin $$\rightarrow$$ Complex proteins in striated muscles

B
Calcitonin and Thymosin $$\rightarrow$$ Thyroid hormones

C
Pepsin and Prolactin $$\rightarrow$$ Digestive enzymes secreted in stomach

D
Secretin and Rhodopsin $$\rightarrow$$ Polypeptide hormones
Solution
1. The various complex proteins involved in muscle contraction are actin and myosin along with troponin and tropomyosin.
2. Thyroid hormones are triiodothyronine (T3) and Tetraiodothyronine (T4) which help in regulating the Basal Metabolic Rate of the body.
3. Pepsin is a protein digestive enzymes secreted in the stomach but prolactin is a hormone secreted by the anterior pituitary.
4. Secretin is a polypeptide hormone which functions to regulate pH of the stomach by inhibiting gastric acid secretion but rhodopsin is the visual pigment present in our eyes and a G protein-coupled-receptor.
So, the correct option is
'Troponin and Myosin → Complex proteins in striated muscles'.
Question 10
1 / -0

The striated appearance of a myofibril is due to distribution pattern of

A
Actin and myosin

B
Fascicles

C
Troponin

D
Meromyosin

Solution

Skeletal or voluntary muscle as shown in the diagram have a striped appearance as a result of regular overlapping of thick (Myosin) and thin (actin) myofilaments.
So, the correct option is 'Actin and myosin'.

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Re-Attempt Weekly Quiz Competition

Tissues Test - 76

Result

Tissues Test - 76

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SHARING IS CARING

Question 1

5000-8000

2000-3000

8000-13000

1 million to 1.5 million

Solution

Question 2

Stratum lucidum

Stratum granulosum

Stratum corneum

Stratum spinosum

Solution

Question 3

A nucleus

No nucleus

Mitochondria

Golgi bodies

Solution

Question 4

Electrical stimuli

Chemical stimuli

Mechanical stimuli

All the above

Solution

Question 5

They are red coloured.

They can cross capillaries.

They are enucleate.

Decrease in their number causes leukemia.

Solution

Question 6

Troponin and tropomyosin

Troponin and myosin

Actin and myosin

Troponin 1 and troponin C

Solution

Question 7

A-band

I-band

Actin fibres

H-zone

Solution

Question 8

Smooth muscle

Skeletal muscle

Cardiac muscle

Both A and B

Solution

Question 9

Troponin and Myosin $$\rightarrow$$ Complex proteins in striated muscles

Calcitonin and Thymosin $$\rightarrow$$ Thyroid hormones

Pepsin and Prolactin $$\rightarrow$$ Digestive enzymes secreted in stomach

Secretin and Rhodopsin $$\rightarrow$$ Polypeptide hormones

Solution

Question 10

Actin and myosin

Fascicles

Troponin

Meromyosin

Solution

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