Tag: our skeletal system and the skin

Questions Related to our skeletal system and the skin

A bone left in dilute HCl for about three days will

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

  1. Crack into pieces

  2. Become soft and elastic

  3. Dissolve completely

  4. Remain as it is

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Correct Option: B
Explanation:

A bone left in dilute HCl for about three days will become soft and elastic.

Dilute HCl is considered a mild acid, but it is strong enough to dissolve away the calcium in the bone. Once the calcium is dissolved, there is nothing to keep the bone hard – all that is left is the soft bone tissue.
This is because of reaction of calcium phosphate present in bones with the dilute acid.

Epiphyseal disks, which are present at the ends of long bones, are responsible for________________.

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

  1. Bone elongation

  2. Growth of thickness of the bone

  3. Remodeling the shape of bone

  4. Formation of Haversian system

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Correct Option: A
Explanation:

Answer is option A i.e. "Bone elongation"
Epiphyseal disk is also called as growth plate. Epiphyseal plate (growth plate), is the region between the diaphysis and epiphysis. Epiphyseal plate/ disk is responsible for the lengthwise growth of long bones. Long bones continue to lengthen, potentially until adolescence, through the addition of bone tissue at the epiphyseal plate

Which bones protects the spinal cord? 

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

  1. Flat

  2. Irregular

  3. Long

  4. None of the above

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Correct Option: B
Explanation:

Irregular bones have complex shape and hence, cannot be classified as long, short or flat. Their shape is due to the function they carry out it the body. They provide mechanical support to the body but also protect the spinal cord. Therefore, (b) is the correct answer. 

The bones with similar length, width, depth are _____________. 

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

  1. Flat bones

  2. Long bones

  3. Short bones

  4. None of these

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Correct Option: C
Explanation:

Short bones are approximately cube shaped i.e length, diameter, width and depth all are same. Examples of short bones are carpal and tarsal bones. Therefore, (c) is the correct answer. 

In man ribs are attached to

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

  1. Clavicle

  2. Ileum

  3. Sternum

  4. Scapula

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Correct Option: C
Explanation:

The first seven pair are attached directly to the sternum 8th, 9th and I0th pairs are attached indirectly to the sternum, and the last two pairs of ribs are called floating ribs because their anterior ends are not attached to either the sternum or the cartilage of another ribs.

The second vertebra, the axis which helps in a rotatory
movement of the head has a knob like process called

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

  1. Hypapophysis

  2. Metapophysis

  3. Odontoid process

  4. Zygapophysis

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Correct Option: C
Explanation:

First cervical vertebra is called atlas. Second cervical vertebra is known as axis. The atlas supports the head. Axis has a peg like process called Odontoid  process / Dens.

Marrow cavity present at the ends of long bone is internally
lined by _____________.

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

  1. Periosteum

  2. Endosteum

  3. Epiosteum

  4. Sarcolemma

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Correct Option: B
Explanation:

Endosteum is a thin single layer of epithelium, lines the marrow or medullarycavity.

Sell turcia is a

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

  1. Covering in born

  2. Covering of testis

  3. Depression in brain

  4. Depression in skull which lodges the pituitary body

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Correct Option: D
Explanation:

Sella turcica or Turkish saddle' is a depression in the Hoar of the mammalian skull in the sphenoid (Basi sphenoid) bone in which the pituitary body is lodged.

Coccygeal bone is formed by the fusion of ......... bones in
man

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

  1. 3 vertebrae

  2. 6 vertebrae

  3. 5 vertebrae

  4. 4 vertebrae

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Correct Option: D
Explanation:

The four coccygeal vertebrae fuse together in adult to form a single small triangular bone called coccyx. It articulates with the tip of the sacrum.

Ends of long bones are covered with

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

  1. Cartilage

  2. Muscles

  3. Ligaments

  4. Blood cells

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Correct Option: A
Explanation:

Ends of long bones are covered with cartilage` Ends of long bones takes Part in forming the joint so the ends are covered by hyaline cartilage (articular cartilage).