Tag: our skeletal system and the skin

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Questions Related to our skeletal system and the skin

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

A bone left in dilute HCl for about three days will

  1. Crack into pieces

  2. Become soft and elastic

  3. Dissolve completely

  4. Remain as it is
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. Bone elongation

  2. Growth of thickness of the bone

  3. Remodeling the shape of bone

  4. Formation of Haversian system
Reveal answer Fill a bubble to check yourself
A Correct answer
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

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

Which bones protects the spinal cord? 

  1. Flat

  2. Irregular

  3. Long

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
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. 

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

In man ribs are attached to

  1. Clavicle

  2. Ileum

  3. Sternum

  4. Scapula
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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

  1. Hypapophysis

  2. Metapophysis

  3. Odontoid process

  4. Zygapophysis
Reveal answer Fill a bubble to check yourself
C Correct answer
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.