Tag: biology

A snail uses its single long, muscular foot to crawl on a layer of mucus-like slime that it secretes. This mucus has unusual physical properties and scientists assumed that these sticky properties were essential for snail movement. 

• The skeleton is the site of haematopoiesis, the development of blood cells that takes place in the bone marrow. 
• In children, haematopoiesis occurs primarily in the marrow of the long bones such as the femur and tibia. 
• In adults, it occurs mainly in the pelvis, cranium, vertebrae, and sternum. Hence, the Skeleton is the site of Haematopoiesis.

Sesamoid bones develop in some tendons in locations where there is considerable friction, tension and physical stress. They are typically found in palm of hands and soles of feet. Therefore, (d) is the correct answer. 

1. Innominate is used to designate many parts otherwise unnamed.
   
2. Innominate artery is a great part of the arch of the aorta.
3. The innominate bone is the hip bone which is part of the skeleton system

There are usually 12 pairs of ribs in human body, first seven pairs of ribs are known as true ribs because these are attached to sternum.

Each hind limb contains 30 bones namely femur in thigh, patella inthe knee, tibia and fibula in the lower leg, 7 tarsals in the ankle, 5 meta-tarsals in the sole and 14 phalanges in toes.

• Hindlimb is composed of  Femur (thigh bone – the longest bone), tibia and fibula, tarsals (ankle bones – 7 in number), metatarsals (5 in number) and phalanges (digits – 14 in number).
  
• When a cricket player is chasing a ball it represents he is running. during running hind limbs assist motion hence muscles off hind limbs contribute to the motion.
  
• Hence when a cricket player is chasing a ball. the group of muscles which contribute to this movement are tarsals, femur, metatarsals, tibia.
• So, the correct answer is 'Tarsals, femur, metatarsals, tibia'.

• The osteon or Haversian system is the fundamental functional unit of much compact bone. 
• Osteons are roughly cylindrical structures. 
• Presence of the Haversian system is a typical character of mammalian bone. Panther is a mammal. Hence, bones of panther shall have a Haversian system.
  

A hinge joint is a common class of synovial joint that includes the ankle, elbow and knee joints. Hinge joints are formed between two or more bones where the bones can only move along one axis to fold or extend. The elbow is a more complex hinge joint that forms between the humerus of the upper arm and the ulna and radius of the forearm. So, the correct answer is 'Hinge'.