This document contains a series of multiple choice questions about human anatomy from a YouTube video. It provides the questions, correct answers, and brief explanations for each answer. There are 5 sample questions covering topics like the structure of the cell membrane, characteristics of cytoplasmic organelles and exocrine glands, the number of major salivary glands in humans, and the percentage of total saliva produced by the parotid glands. The document is intended to help medical students and professionals refresh their knowledge of essential human anatomy concepts.

1. MCQs in
Human
Anatomy
Dr Upul Udayaraj Jayasinghe
MBBS, MRCSEd, MRCSI,
Speciality Certificate in Gastroenterology(UK),
Speciality Certificate in Endocrinology & Diabetes(UK),
Diploma in Diabetes Mellitus(India/UK),
Diploma in Human Anatomy and Physiology
https://www.youtube.com/watch?v=aVP430l8BrU&t=12s

2. Note that the MCQs(Multiple choice questions) on this video
are more suitable for medical students; however, medical
professionals those who are preparing for postgraduate
examinations also can refresh essential basics in anatomy, as
they provide useful knowledge in the relevant subject area in
general. Hence, it is recommended you to go through these
videos and gather some information to gain success in future
medical and surgical field examinations.

3. Q 1
Which statement is correct regarding the cell membrane?
A. It is approximately 7nm in thickness
B. It is selectively permeable but unable to regulate what
enters and exits the cell
C. It allows passage of specific ions through carbohydrate-
gated channels
D. It has a significant content of proteins, typically around
80% of membrane volume
E. It is a bilayer of proteins associated with phospholipids

4. Q 1
Correct Answer – A
The formation of biological membranes based on the properties of lipids; and all cell
membranes share a standard structural organization.
In brief, it is a bilayer of phospholipids with associated proteins.
Lipids constitute approximately 50% of the mass of most cell membranes, although this
proportion varies depending on the type of cell membrane. Anyhow, most of the plasma
membranes are approximately 50% lipid and 50% protein. On the other hand, the inner
layer of the membrane of mitochondria contains an unusually high fraction (about 75%) of
protein, reflecting the abundance of protein complexes involved in electron transport and
oxidative phosphorylation.
The cell membrane is selectively permeable and able to regulate what enters and exits the
cell, thus facilitating the transport of materials needed for survival.

6. Q 2
Which is incorrect regarding cytoplasmic organelles?
A. Cytoplasmic organelles are the membrane-bound
structures in a cell
B. They together comprise the cell cytoskeleton
C. They are involved with the carbohydrate metabolism
D. They are concerned with the collection and transport of
cellular elements and chemicals
E. They are involved in energy production and phagocytosis

7. Q 2
Correct Answer – B
By definition, organelles are the membrane-bound structures in a
cell.
The nucleus is an example.
Other organelles locate in the cytoplasm such as mitochondria,
chloroplasts, endoplasmic reticulum, Golgi apparatus, peroxisomes,
lysosomes, vacuoles and glyoxysomes.
The cytoskeleton is a varied collection of filamentous structures
within the cytosol/ cytoplasm.

9. Q 3
Which description is correct regarding exocrine glands?
A. Exocrine glands typically discharge their contents
directly into the blood
B. They usually secrete in a holocrine manner
C. They are of mesenchymal origin
D. They are absent in stratified squamous epithelium
E. They may be unicellular

10. Q 3
Correct Answer – E
Exocrine glands have ducts opening on to a surface.
Endocrine glands, not exocrine glands, typically discharge their
contents directly into the blood.
Most exocrine glands secrete without damage to the cells, hence,
not in holocrine manner.
They are of epithelial origin, not a mesenchymal origin.
Sebaceous and sweat glands are in stratified squamous
epithelium.
Goblet cells are unicellular exocrine glands.

13. Q 4
The salivary glands are exocrine glands that produce saliva through
a ducts system. Humans have some major salivary glands as
well as hundreds of minor salivary glands.
How many major salivary glands are there?
A. Two
B. Four
C. Six
D. Eight
E. Ten

14. Q 4
Correct Answer – C
The salivary system comprises three primary paired glands, namely
the parotid, submandibular and sublingual together with tiny
accessory salivary glands scattered over the walls of the buccal
cavity.
They can be classified as serous, mucous or seromucous (mixed).

15. Main Salivary Glands
• Parotids
– Produce a serous, watery secretion
• Submandibular
– Produce a mixed serous and mucous secretion
• Sublingual
– Secrete a saliva that is predominantly mucous in
character

16. Q 5
The salivary glands are exocrine glands that produce saliva through
a ducts system. Humans have some major salivary glands as well as
hundreds of minor salivary glands.
What percentage of total saliva produced by the salivary glands is
provided by the parotid glands?
A. 60%
B. 70%
C. 80%
D. 90%
E. 50%

17. Q 5
Correct Answer – C
Generally, the parotid gland secretes up to 50% of the saliva volume
and secretes only serous saliva.
Submandibular contribute around 60–67% of unstimulated saliva
secretion; however, on stimulation, their contribution decreases in
proportion as the parotid secretion rises to 50%.Sublingual provide
only 3-5% of the total salivary volume.

18. Thank you
https://www.youtube.com/watch?v=aVP430l8BrU&t=12s