CBSE Questions for Class 11 Medical Biology Locomotion And Movement Quiz 10 - MCQExams.com

$$\textbf{Correct Option B}$$

$$\textbf{Solution}$$

$$\bullet$$ $$\textbf{Option A}$$  Bone deformation is the symptom of osteoarthritis or displacement and angulation of bones. The bones are structurally distorted from its normal shape and size.

$$\bullet$$ $$\textbf{Option B}$$  Muscular dystrophy and paralysis are the symptoms of neurological disease lathyrism which is caused due to the consumption of lathyrus sativus. This is a legume plant which which causes this neurological disorder in human beings.

$$\bullet$$ $$\textbf{Option C}$$  Asphyxia is a symptom of asthma which brings shortness of breath or difficulty in breathing. This happens because of the lack of oxygen.

$$\bullet$$ $$\textbf{Option D}$$ Cardiac arrest happens because of abnormal beating of heart. It can also be caused by any coronary heart disease or inflammation of heart muscles.

So, the correct option is B. 

$$\textbf{Correct Option A}$$

$$\textbf{Solution}$$

$$\bullet$$Autoimmune disorder is a condition in which the immune system of our body attacks and destroys its own tissues without knowing. The body destroys its healthy tissues by a mistake.

• The joint between the atlas and axis vertebrae in man is the pivot joint.
• These joints allow only one type of movement, the rotation of one bone on or around another.  
• An example of a pivot joint is the joint between the atlas and axis (C1 & C2) vertebrae, the rotation around each other allows our heads to pivot left and right. 

• Nitric oxide triggers the signaling pathway for smooth muscle relaxation or vasodilation that increases the flow of blood through the arteries. This leads to a better supply of oxygen to the vital organs but decreases the pressure on the heart to pump blood at a faster rate.
•  Especially at higher altitudes, where the oxygen level is low in the atmosphere. So population living at higher altitudes have elevated levels of nitric oxide in their lungs, which is also reflected in the amount that is exhaled out

$$\textbf{Correct Option A}$$

$$\textbf{Solution}$$

$$\bullet$$Bipedal locomotion is a type of locomotion in which the organism can move with the help of two legs in an upright position. The organism is able to walk and run on two rear limbs.

• A decline in a muscle's ability to maintain a constant level of force, or tension after prolonged, repetitive stimulation is called tetanus.
  
• A tetanic contraction is a sustainable contraction evoked when motor nerve innervates a skeletal muscle emitting action potential at a very high rate.