Skeletal System By Ambulancecpd.Co.UK

The upper 7 pairs of ribs are called true ribs because they directly attach to the sternum (breastbone) through their own costal cartilage, providing direct support and protection to the thoracic cavity. False ribs, on the other hand, do not directly attach to the sternum but rather connect to the cartilage of the rib above them, making them less directly connected and less protective.

The skeleton is divided into two divisions: the axial skeleton and the appendicular skeleton. The axial skeleton includes the skull and thoracic cage, which protect vital organs such as the brain and heart. The appendicular skeleton consists of the lower limbs, which provide support and enable movement.

There are 12 thoracic vertebrae in the human body. The thoracic vertebrae are located in the middle region of the spine, between the cervical and lumbar vertebrae. They are larger and stronger than the cervical vertebrae and have a unique structure that allows for the attachment of the ribs. The number of thoracic vertebrae remains constant in most individuals, with 12 being the typical number.

There are 7 cervical vertebrae in the human body. The cervical vertebrae are the smallest and uppermost vertebrae in the spine, located in the neck region. They provide support and flexibility to the head and neck, allowing for various movements such as rotation and bending. The number 7 is the correct answer because it accurately represents the number of cervical vertebrae in the human body.

In the given picture, the highlighted yellow area represents the central core of the skeleton, which includes the skull, vertebral column, and rib cage. This section is responsible for providing support and protection to the vital organs and structures in the body. Therefore, it is referred to as the axial skeleton. On the other hand, the appendicular skeleton refers to the bones of the limbs and their attachments to the axial skeleton.

The area highlighted in green in the picture is called the appendicular skeleton. The appendicular skeleton consists of the bones that make up the limbs and the girdles that connect them to the axial skeleton. This includes the bones of the arms, legs, shoulders, and pelvis. The axial skeleton, on the other hand, includes the bones of the skull, spine, and ribcage.

The framework of the skeleton is made up of 206 bones.

The correct answer is 5. The lumbar vertebrae are located in the lower back region of the spine. There are typically five lumbar vertebrae in the human body. These vertebrae are larger and stronger than the other vertebrae in the spine, as they support most of the body's weight and allow for movement and flexibility in the lower back.

Bones are covered by a dense, fibrous membrane called periosteum. The periosteum serves as a protective layer for the bones, providing them with nourishment and blood supply. It also plays a crucial role in bone growth, repair, and regeneration. Without the periosteum, bones would be more susceptible to damage and would lack the necessary support for their functions.

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Dense bone has a high stress bearing capability. This is because dense bone, also known as compact bone, is made up of tightly packed layers of bone tissue. It provides strength and support to the skeleton, making it able to withstand high amounts of stress and pressure. Spongy bone, on the other hand, is less dense and has a more porous structure, making it better suited for shock absorption and providing a lightweight framework.

A human has 3 pairs of false ribs. The false ribs are the last five pairs of ribs in the ribcage, which are not directly connected to the sternum. Instead, they are attached to the cartilage of the rib above them. The first seven pairs of ribs are true ribs, as they are directly connected to the sternum. The remaining five pairs are false ribs, with three pairs being attached indirectly and the last two pairs being floating ribs, not attached to the sternum at all.

Ligaments are the correct answer because they are tough bands of fibrous connective tissue that attach one bone to another bone. They provide stability and strength to the joints by preventing excessive movement or dislocation. Tendons, on the other hand, attach muscles to bones, and muscles are responsible for movement and generating force.

Spongy bone contains red marrow. Red marrow is responsible for the production of red blood cells, white blood cells, and platelets. It is found in the spongy bone, which is also known as cancellous bone. Spongy bone has a porous and lattice-like structure that provides strength and support to the bone while allowing the bone marrow to occupy the spaces within. Compact bone, on the other hand, is denser and forms the outer layer of bones, providing protection and stability. However, it does not contain red marrow.

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The sacrum is a triangular-shaped bone located at the base of the spine, formed by the fusion of five vertebrae. Therefore, the correct answer is 5.

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The bones of the skeleton are classified into different shapes. Long bones are characterized by their elongated shape, with a shaft and two ends. Short bones are cube-shaped and provide stability and support. Flat bones are thin and flat, providing protection to internal organs. Irregular bones have complex shapes and do not fit into the other categories. Sesamoid bones are small, round bones found within tendons. Axial bones are those that make up the central axis of the body, including the skull, vertebral column, and ribcage. Appendicular bones are those that make up the limbs and their attachments to the axial skeleton.

The spine is made up of 33 bones. The human spine is composed of a series of individual bones called vertebrae, which are stacked on top of each other. There are 33 vertebrae in total, including 7 cervical vertebrae in the neck, 12 thoracic vertebrae in the upper back, 5 lumbar vertebrae in the lower back, 5 sacral vertebrae fused together to form the sacrum, and 4 coccygeal vertebrae fused together to form the coccyx. Each vertebra plays a crucial role in supporting the body, protecting the spinal cord, and allowing for movement.

The axial skeleton is made up of the skull, spine, and thoracic cage. The skull forms the structure of the head and protects the brain. The spine, also known as the vertebral column, consists of individual vertebrae that support the body and protect the spinal cord. The thoracic cage includes the ribs and sternum, forming a protective cage around the organs in the chest, such as the heart and lungs. The lower limbs and upper limbs are not part of the axial skeleton, but rather belong to the appendicular skeleton, which includes the bones of the limbs and their associated girdles.

Cartilage is a type of connective tissue that acts as a cushion between bones at the point where they meet, known as a joint. It provides a smooth surface that reduces friction between the bones during movement. This layer of cartilage helps to absorb shock and distribute pressure evenly across the joint, allowing for smooth and painless movement.

The correct answer is 4 because the coccyx, also known as the tailbone, is made up of four fused vertebrae at the base of the spine. These vertebrae are small and triangular in shape.

12 either side

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A human has two pairs of floating ribs. Unlike the upper ribs, which are attached to the sternum, the floating ribs are not connected to the sternum at all. They are only attached to the vertebrae in the back, providing less stability and flexibility to the ribcage. Therefore, there are only two pairs of floating ribs in a human body.

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Bones are made up of two types of bone tissue: compact bone and spongy bone. Compact bone is dense and forms the outer layer of bones, providing strength and protection. Spongy bone, also known as cancellous bone, is found inside the compact bone and has a porous structure. It helps to reduce the weight of the bone while still providing support. Together, these two types of bone tissue work together to maintain the structure and function of the skeletal system.

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The skeletal system has several functions. It provides support to the body, maintaining its structure and allowing us to stand upright. It also protects vital organs such as the brain, heart, and lungs. The skeletal system is involved in movement, as it provides attachment points for muscles and allows us to perform various actions. It serves as a storage site for minerals like calcium and phosphorus, which are essential for bone health. Additionally, the skeletal system plays a role in blood cell production, specifically in the bone marrow. It is not directly involved in energy storage, but it does support the muscles and other tissues that store energy.

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The correct answer is 99%. Calcium is a vital mineral that is primarily stored in bones and teeth. It plays a crucial role in maintaining bone health and strength. About 99% of the body's calcium is stored in the bones, while the remaining 1% is found in the blood and soft tissues, where it is involved in various physiological processes.

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