_____ is a hormone secreted by the thymus that can stimulate the immunological activity of lymphoid tissue.

Thymocytes are derived from ( ). A: bone marrow B: thymus C: lymph node D: spleen

垂体 A: pituitary gland B: thyroid gland C: thymus gland D: adrenal gland

Which organ is the central immune organ? ( ) A: Spleen B: lymph node C: MALT D: Thymus

Which is the largest peripheral immune organ____? A: Bone marrow B: Spleen C: Thymus D: Lymph nodes

Which of the following organs does not belong to endocrine glands?<br/>() A: Pituitary gland B: Thyroid C: Prostate D: Thymus

The key organ involved in stress response is ( ) A: Thyroid gland B: Thymus C: Adrenal gland D: Gonad E: Prostate

Which organ is the main organ to filtrate blood? A: Liver B: Lymph node C: Spleen D: Thymus E: Tonsil

Which organs are central immune organs? A: Spleen B: Lymph nodes C: Lymph tissue D: Thymus E: Bone marrow

Which one of the following structures is not the lymphatic organ?() A: the lymph node B: the aggregated lymphatic follicle C: the palatine tonsil D: the spleen E: the thymus