A thick cuticle reduces water loss through transpiration, helping desert plants conserve water. Underwater plants do not face water shortage, so a thick cuticle would hinder gaseous exchange and absorption, making survival and normal functioning difficult.
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Simple squamous epithelial tissue in the lungs allows oxygen to enter the blood. Its thin, flat cells provide a short diffusion pathway, enabling rapid exchange of oxygen and carbon dioxide between air sacs and blood vessels efficiently.
Yes, we can consciously control voluntary movements using skeletal muscles attached to bones. Actions like walking, writing and lifting objects occur when the nervous system sends signals to skeletal muscles, causing coordinated movement in different body parts.
The body senses, communicates and responds through nervous tissue. Neurons receive signals from receptors, process information in the brain and spinal cord, then transmit messages to muscles or organs, enabling quick and coordinated responses to stimuli.
Bones contribute about 12–15 percent of an adult human’s body weight. This percentage may vary depending on age, gender and body composition. Bones provide support, protection, posture and structure, forming the framework of the musculoskeletal system.