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How many of the given statements are inc...

How many of the given statements are incorrect ?
A. The sternum is the part of the axial skeleton.
B. 5 pairs of ribs are not true ribs.
C. Limbs are part of the appendicular skeleton.
D. pectoral girdle connects sternum to the femur .

A

None

B

One

C

Two

D

All

Text Solution

AI Generated Solution

The correct Answer is:
To determine how many of the given statements are incorrect, we will evaluate each statement one by one. ### Step-by-Step Solution: 1. **Statement A: The sternum is the part of the axial skeleton.** - **Evaluation:** This statement is correct. The sternum is indeed a part of the axial skeleton, which includes the skull, vertebral column, and rib cage. The sternum plays a crucial role in protecting vital organs such as the heart and lungs. 2. **Statement B: 5 pairs of ribs are not true ribs.** - **Evaluation:** This statement is incorrect. In humans, there are 12 pairs of ribs. The first 7 pairs are classified as true ribs because they are directly attached to the sternum via costal cartilage. The remaining 5 pairs are considered false ribs, which include 3 pairs of vertebrochondral ribs and 2 pairs of floating ribs. Therefore, the statement incorrectly states that 5 pairs are not true ribs. 3. **Statement C: Limbs are part of the appendicular skeleton.** - **Evaluation:** This statement is correct. The limbs (arms and legs) are indeed part of the appendicular skeleton, which also includes the pectoral girdle and pelvic girdle. 4. **Statement D: Pectoral girdle connects sternum to the femur.** - **Evaluation:** This statement is incorrect. The pectoral girdle (which consists of the clavicles and scapulae) connects the upper limbs to the axial skeleton at the sternum, but it does not connect to the femur. The femur is part of the lower limb and connects to the pelvic girdle. ### Summary of Evaluations: - Statement A: Correct - Statement B: Incorrect - Statement C: Correct - Statement D: Incorrect ### Conclusion: Out of the four statements, two statements (B and D) are incorrect. Therefore, the answer to the question is that **2 statements are incorrect**.
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