The type of joint that allows the head to rotate from side to side is:
A. Pivot joint
B. Gliding joint
C. Hinge joint
D. Ball and socket joint
Answer: Option A
Solution (By JKExamLibrary)
The atlantoaxial joint (between atlas and axis vertebrae) is a pivot joint, allowing rotation of the head ('no' motion). Hinge allows flexion/extension, ball and socket multiaxial, gliding sliding. The odontoid process of the axis acts as a pivot.
Explanation:
Photolysis of water provides electrons and protons for the light reactions, releasing O₂; NADPH formed carries hydrogen to reduce CO₂ in the Calvin cycle. R correctly explains A.
Explanation:
The tricuspid valve (right atrioventricular valve) has three cusps and closes during ventricular systole to prevent regurgitation into the right atrium. The bicuspid (mitral) is on the left side. Aortic and pulmonary valves are semilunar valves at the ventricular outlets.
Explanation:
Neurons are the excitable cells that generate and transmit electrochemical impulses. Glial cells (neuroglia) provide support, insulation, and nutrients. Fibroblasts form connective tissue, epithelial cells line surfaces. The neuron is the functional unit of the nervous system, connected at synapses.
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