Tag: our skeletal system and the skin

Questions Related to our skeletal system and the skin

What is the term used for the opening or hole in a bone?

biology our skeletal system and the skin bones and movements joints in the human body joints

  1. Process

  2. Fossa

  3. Foramen

  4. Tubercle

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Correct Option: C
Explanation:

The foramen is the hole is an opening or groove in the bone that allows blood vessels and nerve to enter the bone. It i1s one of the several ovals or circular openings in the base of the skull.

So, the correct option is 'Foramen'.

Total number of bones in axial skeleton of man are

biology our skeletal system and the skin bones and movements joints in the human body joints

  1. 206

  2. 120

  3. 406

  4. 80

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Correct Option: D
Explanation:

The axial skeleton is the part of the skeleton that consists of the bones of the head and trunk of a vertebrate.

It consists of 80 bones and is composed of six parts; the skull bones, the ossicles of the middle ear, the hyoid bone, the rib cage, sternum and the vertebral column.
Skull has 28 bones - 8 cranial bones, 14 facial bones and 6 ossicles of middle ear.
Hyoid is single bone.
Vertebral column consists of 26 bones - 7 cervical vertebrae, 12 thoracic vertebrae, 5 lumbar vertebrae, 1 sacrum and 1 coccyx.
Thoracic cage consists of 1 sternum and 24 ribs. 
So, the correct answer is '80'

Thoracic cage in rabbit is made up of

biology our skeletal system and the skin bones and movements joints in the human body joints

  1. Ribs, vertebral column and diaphragm.

  2. Ribs, diaphragm and sternum.

  3. Vertebral column, diaphragm and sternum.

  4. Ribs, vertebral column and sternum.

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Correct Option: D
Explanation:

In mammals, like rabbit and humans thoracic vertebrae, ribs and sternum together form the rib cage. In humans, the rib cage, also known as the thoracic cage, is a bony and cartilaginous structure which surrounds the thoracic cavity and supports the pectoral girdle (shoulder girdle), forming a core portion of the human skeleton. A typical human rib cage consists of 24 ribs, the sternum (with xiphoid process), costal cartilages, and the 12 thoracic vertebrae. 

Vertebro-arterial canal is present in

biology our skeletal system and the skin bones and movements joints in the human body joints

  1. Lumbar vertebrae

  2. Cervical vertebrae

  3. Thoracic vertebrae

  4. Vertebral column

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Correct Option: B

Scapula is a large triangular flat bone situated in the dorsal part of the thorax between

biology our skeletal system and the skin bones and movements joints in the human body joints

  1. The second and fifth rib

  2. The second and seventh rib

  3. The third and sixth rib

  4. The third and eighth rib

  5. The fourth and seventh rib

Show answer
Correct Option: B
Explanation:

The scapula is commonly referred to as the shoulder blade. It connects the humerus bone of the arm to the collarbone. It is located between the second and seventh ribs. 

The number of vertebrae present in cervical, thoracic, lumbar, sacral and coccyx regions respectively in a child are

biology our skeletal system and the skin bones and movements joints in the human body joints

  1. 12, 7, 5, 1, 1

  2. 1, 7, 5, 12, 1

  3. 7, 5, 1, 12, 1

  4. 7, 12, 5, 5, 4

  5. 5, 12, 7, 1, 1

Show answer
Correct Option: D
Explanation:

Vertebral column is part of the axial skeleton. It is the flexible column extending from neck to tail.

The human vertebral column consists of 33 vertebrae. These are divided into different regions, which correspond to the curves of the spinal column. The vertebrae are numbered and divided into regions: cervical, thoracic, lumbar, sacrum, and coccyx.
Cervical: The 7 cervical vertebrae are numbered C1 to C7 in neck. Its function is to support the weight of the head.
Thoracic: The 12 thoracic vertebrae are numbered T1 to T12. Main function of the thoracic spine is to hold the rib cage and protect the heart and lungs.
Lumbar: The 5 lumbar vertebrae are numbered L1 to L5. Main function of the lumbar spine is to bear the weight of the body.
Sacrum: There are 5 sacral vertebrae, which are fused together. Main function of the sacrum is to connect the spine to the hip bones.
Coccyx: The 4 fused bones of the coccyx provide attachment for ligaments and muscles of the pelvic floor. 
Therefore the number of vertebrae present in cervical, thoracic, lumbar, sacral and coccyx regions respectively are 7, 12, 5, 5, 4.
So, the correct answer is '7,12,5,5,4.

Sacrum in human is formed by the fusion of

biology our skeletal system and the skin bones and movements joints in the human body joints

  1. 3 vertebrae

  2. 5 vertebrae

  3. 8 vertebrae

  4. 6 vertebrae

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Correct Option: B
Explanation:

The sacrum is a part of the vertebral column. It is formed by the fusion of 5 bones. It is a large, triangular bone at the base of the spine. The main function of the sacrum is to connect the spine to the hip bones (iliac). The sacrum is a very strong bone that supports the weight of the upper body as it is spread across the pelvis and into the legs. Thus, the correct answer is option A.

Which ribs show bucket-handle type of movement?

biology our skeletal system and the skin bones and movements joints in the human body joints

  1. Rib No. $1-2$

  2. Rib No. $3-5$

  3. Rib No. $6-10$

  4. Rib No. $11-12$

Show answer
Correct Option: C
Explanation:

The upward movement of ribs due to contraction of intercostal muscles which in turn increases the anteroposterior diameter of the chest is called as pump handle movement. The outward and upward movement of ribs to increase the transverse diameter of the thorax is termed as bucket handle movement.  Upper ribs show more pump handle activity as they have a transverse axis of motion between costovertebral and costotransverse articulation which makes options A and B incorrect. 

The anteroposterior axis of motion, in which anterior and posterior ends of ribs are fixed, provides more bucket handle movement to lower ribs. This makes option C correct. 
Option D is incorrect as the absence of anterior and posterior costotransverse articulations do not support pump handle and bucket handle movements. 
Therefore, the correct answer is option C.

Tuberculum and capitulum are related to

biology our skeletal system and the skin bones and movements joints in the human body joints

  1. Skull

  2. Pelvic girdle

  3. Ribs

  4. Neural arches

Show answer
Correct Option: C
Explanation:

At the spinal column, the rib starts with the rib head (caput costae or capitulum). The rib bone progresses backwards via the rib neck (collum costae) to the rib tubercle (tuberculum costae). This is where the rib body (corpus costae) begins, which curves round to the front with the rib angle (angulus costae).

The peculiarity of cervical vertebrae is

biology our skeletal system and the skin bones and movements joints in the human body joints

  1. Odontoid process

  2. Large spine

  3. Large centrum

  4. Transverse arterial canals

Show answer
Correct Option: D
Explanation:

In human beings, the cervical vertebrae comprise of the vertebrae of the neck, immediately below the skull. This is the smallest of the true vertebrae, and the distinguishing feature is the presence of a foramen or hole in each transverse process and through which the vertebral artery passes.

So, the correct answer is option D.