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Skeletal System

The skeletal system provides definite shape and mechanical support to the body, and it also helps in movement and locomotion. Ask questions about the skeletal system and bones here.

14,490 Questions

How is the large number of bones found in the feet and hands of human beings both an advantage and disadvantage?

Advantages: flexible, more difficult to break, lighter, does not require a separate evolution history, shorter arcs of motion for simpler "hinges".

  • Confers pliability and adaptability to uneven surfaces.
  • Permits long flexors and short muscles to exert their action on the bones of the forefoot and toes, thus assisting the propulsive action of gastrocnemius and soleus.

Which bone forms the cheek bone?

The zygomatic bone forms the cheekbone, also known as the zygomatic arch. It contributes to the structure of the face and helps protect the eye and other facial structures.

Do you wear a knee brace for tendonitis?

Knee braces can help with patella tendonitis or Ilitibail Band syndrome (ITBS)

If its patella tendonitis you have (inflammation of the tendon just below the kneecap) then a single patella strap can work really well. It puts pressure through the tendon and supports the kneecap which reduces the forces and friction through the tendon.

If it's ITBS - irritation of the iliotibial band on the outer side of the knee, a double knee strap can work well as it puts pressure through the ITB, again reducing friction.

You may also find that doing strengthening and stretching exercises helps aswell

Cartilage is hareder than bone true or false?

False. You have it backwards.

Bone is the hard structure that give your body form, posture, and strength. They are stiff and cannot bend. They are hard.

Cartilage is the soft, flexible, yet tough tissue found in the tops of your ears, and the tip of your nose.

When you are an infant, many bones are partly cartilage, especially the skull. When you start growing, these bones get bigger and harden into actual bones.

What two cellular organelles are prominent in osteoblasts?

The two cellular organelles that are prominent in osteoblasts are the endoplasmic reticulum and the Golgi apparatus. The endoplasmic reticulum is involved in protein synthesis, while the Golgi apparatus functions in packaging and modifying proteins for secretion. Both organelles are essential for the formation and secretion of bone matrix proteins by osteoblasts.

IS upward rotation of the scapula the same as lateral rotation?

No, upward rotation of the scapula refers to movement where the scapula moves upward and rotates in an upward direction around the axis. Lateral rotation, on the other hand, is the rotation of a bone around its longitudinal axis. These are two different types of movements.

What is the name of the bone marking of the femur that articulates with the pelvic girdle?

The bone marking of the femur that articulates with the pelvic girdle is called the head of the femur.

What is the difference between a female and male pelvis?

The female pelvis tends to be wider, shallower, and lighter than the male pelvis, with a larger pelvic opening to accommodate childbirth. The male pelvis is usually narrower, more robust, and heavier, with a smaller pelvic opening. These differences are due to the requirements of pregnancy and childbirth in females versus the need for stronger support and mobility in males.

Which cells arise from bone marrow and migrate to the epidermis?

Melanocytes are cells that arise from the neural crest during development and migrate to the epidermis. They are responsible for producing the pigment melanin, which contributes to skin color and protection from UV radiation.

What is the upper flat portion of the heart that is located at the level of the second rib?

The upper flat portion of the heart located at the level of the second rib is the base of the heart. It is where the great vessels such as the aorta and pulmonary arteries are attached, allowing blood to enter and exit the heart. The base of the heart is directed towards the right shoulder and is connected to the diaphragm and spinal column.

What is the lump of immature bone cells that surround a broken bone?

A bone callus is the lump of immature bone cells that surround a fracture.

Where in the body is the mastoid bone?

The purpose of the mastoid process is to function as an attachment for particular muscles of the neck. It is situated in the posterior part of the temporal bone.

Why do people have spongy bone and compact bone?

Compact bone and spongy bone both perform different functions.

Compact bone forms the outer tissue of bone. It forms the walls of the diaphysis of long bones and part of the epiphyses. It is vascularized tissue that accepts nourishment from the blood vessels.

Spongy bone is located in the spaces that fill with bone marrow (central marrow cavity) in long bones (interior of the epiphyses) and adds strength to bone with minimal weight.

What are the three types of tissue in bone?

The three types of tissue in bone are compact bone, spongy bone, and bone marrow. Compact bone makes up the dense outer layer of bones, spongy bone forms the inner layer, and bone marrow, found within the bone cavities, is responsible for blood cell production.

Which one is found in a compact bone but not in a spongy bone?

Haversian systems (osteons) are found in compact bone but not in spongy bone. These structures consist of concentric layers of bone tissue surrounding a central Haversian canal containing blood vessels and nerves.

Do men have one less rib than woman?

Both genders have the same number of ribs. In mythology, there is a difference in number because they are created from men.Their ribs where taken from the ribs of men & that is why they are called women (created from man).

How is a tooth attached to the bone of the jaw?

A tooth is attached to the bone of the jaw through the periodontal ligament. This ligament acts like a cushion, allowing the tooth to withstand the forces of biting and chewing. Additionally, the surrounding bone provides support and stability for the tooth.

What is the function of the three structures associated with bones?

The periosteum is a fibrous membrane that covers the outer surface of bones, providing protection and serving as an attachment point for tendons and ligaments. The endosteum lines the inner surface of bones and is involved in bone growth, repair, and remodeling. The medullary cavity is the innermost part of long bones where bone marrow is housed, playing a role in blood cell production and fat storage.

What is this large hard bump on knee cap?

Technically, your knee is not comprised of just one bone. It's a joint, which allows movement. The femur and then the tibia and fibula meet under the kneecap, which is known as the patella.

There are arteries, veins and nerves that are located alongside and on top of the knee joint. If these are injured in any way, it is a surgical emergency, and could possibly lead to death. The purpose of the patella is to protect the arteries, veins and nerves, and in turn, protecting a person's life.

If a femur is 46.2 centimeters long how tall is a female?

Determining a person's height based on the length of a femur alone is not accurate due to variations in body proportions among individuals. Femur length is just one factor in determining height, so it cannot be used as a standalone measurement to calculate a person's height.

When the diaphragm contracts what contract and lift the rib cage?

You have small bands of muscles between the ribs in your rib cage (called external intercostal muscles) that contract when you inhale and pull your ribs up. ?These are semi-active during regular breathing. ?When you are exercising and need to breathe deep and fast, other muscles also jump in and help your rib cage expand, including your serratus anterior, scalene muscles, and sternocleidomastaoid muscles.


But you are right in saying that the diaphragm does not directly lift the rib cage. ?During normal relaxed breathing, the rib cage mostly just expands on its own (the diaphragm causes your lungs to increase in volume, so the ribs just passively lift up to allow the lungs to expand). ?Only during exercise do your muscles (called accessory muscles of respiration) really do anything to your rib cage.

What happens when you relax the joints in the pelvis during pregnancy?

Relaxing the joints in the pelvis during pregnancy, particularly due to the hormone relaxin, helps to prepare the body for childbirth by allowing the pelvic bones to slightly shift and expand. This increased flexibility can make it easier for the baby to pass through the birth canal during delivery. However, it can also lead to instability and potentially increased risk of certain pelvic joint issues.

Do osteocytes become osteoblasts when they are completely surrounded by bony matrix?

As you know, osteoblasts secrete collagen and organic cmpounds upon which bone is formed. Osteoblasts are incapable of mitosis. As Osteoblasts release matrix materials around themselves, they become enveloped by the matrix and at this point differentiate into Osteocytes.

Why are some really skinny people so strong?

Actually there is no limit discovered so far its more like a statistic. Basically the limit on human strength is the limit of what ever force is put on it that it won't die from and the length of time that person lives. So as long as the force put on you doesn't kill you and you have enough time to heal you can in theory get infinity times stronger,lol.But because of life span I guess you'd say your life span is the limit and right now living to 100 is still now so common so I would guess for most people that makes lifting a weight over of about half a ton of so possible and by that I would be implying a Clean & Press.Which would mean that who ever lifts that could proabably a great deal more in say the Squat.But I would guess that as about the limit give a take 100 pounds. Of course as the Human life span and quality of healthy years gets longers and better the number gets bigger. also it can depend on the weight you carry around. if you had arm and leg weights on that weight 10 kg, your body would try to adapt to the new weight. so in theory if you worked your way up to 1000kg on each arm and leg, you would be strong en-ought to lift 1000kg or more and since the human body adapts to new forces that are put on it, your body could technically lift unlimited amounts of weight in the right conditions.