Question

The pectoral girdle consists of the:

clavicle and sternum
sternum and scapula
clavicle and scapula
clavicle and coccyx

Answer 1

The pectoral girdle is made up of the clavicle, or collarbone, and the scapula, or shoulder blade. These bones connect the upper limbs to the axial skeleton and allow for great mobility in the arms.

Step-by-step explanation:

The pectoral girdle consists of the clavicle and the scapula, which are essential skeletal structures for attaching the upper limbs to the axial skeleton. The clavicle, commonly known as the collarbone, is located anteriorly and serves as a strut between the scapula and sternum, transmitting forces from the upper limb to the trunk, as well as protecting vital nerves and blood vessels. The scapula, also known as the shoulder blade, is positioned posteriorly and aids in forming the shoulder joint, providing a site for muscle attachment and facilitating the extensive mobility required for upper limb movement.

Though the pectoral girdles exist in pairs with a clavicle and scapula on each side of the body, they function independently due to their connection to the axial skeleton via highly mobile joints. This configuration allows for significant flexibility and range of motion in the arms and shoulders, which is critical for a wide array of human activities.

Answer 2

The correct answer is C. Clavicle and scapula

Step-by-step explanation:

The pectoral girdle, also called the shoulder girdle refers to a set of bones that connect the arm to the rest of the skeleton. In human beings and many other species, the pectoral girdle consists of the clavicle that is a long bone that goes from the shoulder to the sternum and the scapula that is a flat bone and goes from the upper zone of the arm to the clavicle. Additionally, in some species, the shoulder girdle includes a third bone called coracoid. According to this, the pectoral girdle consists of the clavicle and the scapula.